The G810 is basically the same as the G910 Orion Spark, except in a more professional looking body (there are no dedicated macro keys, the key tops have a regular shape, and there is no included wrist-wrest).
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Pro Full customizable RGB lighting
The Romer-G switches have less light-bleed, and the Logitech Gaming software lets you light up individual keys to any color you please. The software can also detect games, and provide pre-set lighting profiles for each game.
Pro Media keys
Play, pause, mute, skip buttons are accompanied by a volume roller in the top-right hand corner. These buttons are round, making them quickly and eaily distinguishable.
Pro Romer-G Switches
Logitech's own Romer-G Switch technology is built from the ground up for gamers. The keys actuate at just 1.5mm at a force of 45g, making them feel 25% more responsive.
The Romer-G Switches are also build around RGB lighting, and they provide much less LED lightbleeding.
Yet another benefit is the added durability of these swithces, which are rated at 70 million keystrokes (up from typical 50-60 million of other keyswitches).
Con Slight metallic ring on full key depress
You may notice a slight metallic ring when typing individual keys. Hardly noticeable when typing an email or gaming, but on occasion when depressing individual keys.
Con No switch choice
Romer-G is the only switch available for the G810. The Romer-G switch caps aren't compatible with Cherry MX keykaps, meaning you have very limited customization if you were to personalize it down the road. They are good for gaming with their lesser actuation distance and less travel, although much less satisfying to type on than Cherry MX Blues or Browns (and even reds, but to a much lesser extent).