I'm tempted to do a full review of the G910, as I've got one sitting here alongside a Corsair K95 RGB (MX Brown), and my rather wonderful Filco Multicam MX Blue board with Filco doubleshot caps. Ideally I'd like a Topre board to try against the G910, but never mind.
Briefly then, the board is aimed squarely at gaming, and it does this extremely well. Certainly the Corsair is an extremely nice board to use for typing and gaming, as is the Filco of course, the G910 responsiveness is noticeably sharper than either of the other two. The switch feel radically different from the MX Brown. My initial impression was that Logitech/Omron had created a mechanical rubber dome! After a few minutes of typing, I really started to warm to the Romer switch. On the down stroke, there's an initial resistance as you push through a soft tactile bump, before the stroke quickly becomes linear. The stroke distance is shorter than a Cherry, and bottoming-out feels satisfyingly dampened: More of a 'thump' than a Cherry 'thock!' The Romer stroke has a slightly chalky feel compared to the smooth travel of a Cherry, but it's in no way unpleasant. The caps are very stable and feel extremely sturdy. The typing experience has a 'meaty' sensation, while at the same time feeling extremely light and responsive.
I dismissed the Romer when I heard that Logitech was 'developing their own switch', but when I realised that Omron was involved with that development, it hinted that something a bit special might be happening. Judging by the switches in the K910, I can't wait to see what comes next. I gather that Logitech has an exclusivity on the Romer initially. How long that lasts depends on how deep that design partnership was of course. These switches are no flash-in-the-pans though, They're a stone-cold serious bit of design.
To very quickly compare the three board together (as well as the dismal, appalling Razer Chroma with its joke switches), the G910 comes out on top as a gaming device, and not by a nose, but by a wide margin. The Corsair is a stunningly nice board, but those Cherry RGB switches spill light everywhere, making it very hard to achieve any sort of practically distinctive short cut zones. It's not helped by the Cherry's inability to light up anything on the lower half of a key cap. The G910 absolutely nails the RGB as a gaming tool. It's nowhere near as pretty or artistic as Corsair's, but it's a damned sight more useful for either gaming or typing.

Hmm...Well, it's not quite as mad-looking in reality. With the lights off, it's surprisingly restrained for Logitech!