When comparing Kinesis Advantage2 vs Topre Realforce 104UB, the Slant community recommends Kinesis Advantage2 for most people. In the question“What are the best keyboards for programming?” Kinesis Advantage2 is ranked 8th while Topre Realforce 104UB is ranked 10th. The most important reason people chose Kinesis Advantage2 is:
Having multiple keys under the thumbs lets you keep the rest of your hands still, and helps prevent reaching. For example, the backspace key on a regular keyboard is way in the top right corner, while on the Kinesis keyboard it's under the left thumb. So, to hit the backspace button you just need to move your thumb while on regular keyboards you need to move your whole right hand and stretch your pinky to reach it.
Specs
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Pros
Pro Clusters of keys under each thumb means less reaching
Having multiple keys under the thumbs lets you keep the rest of your hands still, and helps prevent reaching. For example, the backspace key on a regular keyboard is way in the top right corner, while on the Kinesis keyboard it's under the left thumb. So, to hit the backspace button you just need to move your thumb while on regular keyboards you need to move your whole right hand and stretch your pinky to reach it.
Pro Optimised, ergonomic shape that significantly reduces the risk of RSI
This keyboard is sculpted to fit the curvature of your hand more naturally than regular flat boards. This helps reduce the risks of suffering repetitive strain injuries.
Pro No need to constantly move hands sideways
One of this keyboard's best features is that the keys are vertically aligned in straight columns, so that you're not constantly exercising the muscles to move your fingers slightly to the left or to the right. It makes a huge difference.
Pro Comfortable palm rests
The large, raised palm rests provide comfort while typing.
Pro Prepared for macOS, Windows and Linux
Besides the option of easily changing between pre-programmed layouts of these 3 systems, extra OS-specific keycaps come with the keyboard.
Pro Very programmable
This keyboard has several programmable options, like Macro recording, key remapping or keyboard layout (the keyboard can be changed from QWERTY to Dvorak with the touch of a button).
Pro No undesirable movements
Because of its size, this keyboard stands firmly on the desk and doesn't suffer from unwanted movement during use.
Pro Dvorak built in
The keyboard has the dvorak layout built in, so you can switch with a keypress.
Pro Tweaked layout that saves your hands
This keyboard has numerous ergonomic advantages over a keyboard with a standard layout. Some of them are obvious and some are subtle, but they are synergistic and result in a typing experience that places far less stress on the hands. Learning a tweaked keyboard layout is a small price to pay to avoid RSI (repetitive strain injury).
Pro No thumb conflict over the spacebar
On common keyboards, both thumbs rest over the spacebar, meaning they can knock against each other. On the Advantage 2 keyboard, only one thumb can press the keyboard, eliminating this problem.
Pro Good for learning how to touch type
This layout, because of its uniqueness, is perfect to learn touch typing. Even for those that were never able to learn it with common keyboards. It still requires practice to get proficient, of course.
Pro Uses Topre key switches
Topre switches are a mix between mechanical switches and rubber dome switches. They have mechanical components, however they are covered beneath a rubber dome which protects the switch. They bring a mechanical feel, and mix it with the durability of a rubber dome switch.
Pro Variable key weights
Variable weights under each specific groups of keys was done in a bid to prevent RSI (repetitive strain injury). For instance, the groups of keys that the pinky finger hits are much lighter/softer than the rest of the groups of keys that are pressed by the rest of the fingers. Variable weights are achieved by having either heavier or lighter rubber domes. Whilst this idea is very useful for normal typing, for gaming it's not so great: for instance, when dealing with First Person Shooter games that requires WASD keys, those sets of keys feel very light when fingers other than the pinky are used to actuate them.
Pro Silenced option are available
Silenced Topre switches are designed for those who do not particularly like the sound of keyboards being tapped on or for those who may be concern over disturbing others when using a noisy keyboard. Silencing is done mainly by placing a material that absorbs the sound of the slider when it makes contact with the slider housing. This thereby prevents excessive noise when the key has been released after it has been actuated. The overall effect of a silenced Topre is quite astounding as it may give the impression one is on a cheap keyboard (obviously, the reality is actually the opposite).
Pro PBT keycaps
PBT (polybutylene terephthalate) keycaps last longer than other keycap materials, and are more durable. They are more expensive than ABS (acrylonitrile butadiene styrene), which is why they are less commonly found.
Cons
Con Can be a bit flakey at times
The downside of this keyboard is that it can occasionally act up. The biggest problem is that the up-event for a key occasionally gets lost and then some key will auto-repeat until you press it again. Or even worse, it's a key that has no visible effect like an Alt key, and then you have to figure out which key it is that is in the virtual down position, and press it again. It has had this same problem for the last 20 years. You learn to live with it for the sake of your hands.
Con Not great for gaming
This keyboard is amazing for typing, but not great for gaming. Many games make intensive keys such as the Arrow keys or the Alt, Control and Shift keys. With this keyboard, it's not very comfortable to use them so frequently.
Con Proficiency means overcoming a learning curve
Becoming an expert at using this keyboard’s optimized design needs time and patience, since it’s so different from what most people are used to. Some of its drastic layout changes can be disorienting at first. For example, the four arrow keys are separated: up and down on the right side cluster; left and right on the left side cluster.
It’s also built to enforce healthier hand posture and movements, that may feel weird at first. For instance, the keyboard trains you (using a deactivatable key feedback) to press keys smoothly instead of smashing down, which reduces hand strain. Usually, it takes between two to four weeks of regular use to feel completely comfortable at using this keyboard.
Con Not for heavy shortcut users
Con Different switches for the function keys
The functions keys are not build with the same switches than the other keys: they use Cherry ML switches instead of Cherry MX Brown switches. Because of their shorter travel distance, the ML feels quite different. It's awkward to have such different sensations for different parts of the keyboard.
Con Quite bulky, therefore not very portable
As a direct consequence of its unconventional ergonomic shape, the Advantage2 is quite bulky. At 16.5 in’ x 8 in’ x 2.88 in’ (419 mm x 203 mm x 73 mm), it's not the most portable keyboard.
Con Generally not cheap
When the keyboard is not sourced directly from Japan the price may vary (usually higher). At the same time, sourcing directly from Japan may only save one a couple of dollars here and there (after including the forwarding/proxy costs). Ideally, the best solution is to shop around and do one's homework, to see what is more viable in the long run.
Con Lack of customisation available
As is the case with virtually every Topre based keyboard, the 104UB comes with the disadvantage of lacking customisation options. This is mitigated by the fact Realforce generally sells a wide range of coloured keycaps for their keyboards.
Con Keys can occassionally chatter
It's pretty rare (maybe once every 3 months), but Realforce keyboard keys can "chatter" (at least on the Realforce 87u and 103u keyboards). The key is not physically stuck in the keydown position, but nevertheless, the input will continuously and endlessly repeat as if the key was being held down. Further keyboard input is ignored until you unplug the USB cable. It's an uncommon annoyance, however an annoyance nonetheless.