When comparing Topre Realforce 104UB vs Leopold FC660C, the Slant community recommends Leopold FC660C for most people. In the question“What are the best keyboards for programming?” Leopold FC660C is ranked 9th while Topre Realforce 104UB is ranked 10th. The most important reason people chose Leopold FC660C is:
Topre switches are a high end switch which typically cost a hefty premium. They have mechanical components protected underneath a rubber dome which makes them more durable.
Specs
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Pros
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.
Pro Topre switches at a good price
Topre switches are a high end switch which typically cost a hefty premium. They have mechanical components protected underneath a rubber dome which makes them more durable.
Pro Solid construction
The Leopold FC660C is a solid and well-build mechanical keyboard. In fact, it's heavier than the HHKB (Happy Hacking Keyboard).
Pro Topre switches are plate mounted
This board's keys don't feel bouncy thanks to it's topre switch design. Since the torpe switches are mounted directly on the plate, the board feels much stiffer overall.
Pro Compact and portable footprint
If you love your keyboard enough to want to use it everywhere, it should be portable, especially if it's as expensive as this one is. The FC660C is very compact and easy to carry around.
Cons
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.
Con Can suffer from squeeky "plastic on plastic" rubbing with the case
Con Very expensive
Con Non standard key sizes
Non standard key sizes means your aftermarket keycap options are limited to non-modifiers. This issue also exists with virtually every other keyboard that utilises the Topre switch.