After going longer than 10 years since my last mechanical keyboard,(an old clicky blue IBM) I wanted to get back into one again, but not something quite so noisy. I researched various Cherry MX flavors & figured that I'd prefer something like the browns or blacks.(reds were just too mushy feeling for my taste) While out shopping & trying to get a real hands-on feel of a mechanical brown or black keyboard at a store,(something I was unable to accomplish, due to store model availability) I came across some Logitech Orion models, with their Romer-G mechanical keys.
The feel was great, so I got the G810 & never looked back. I would imagine that the feel is somewhere between a MX brown and MX black... It's a solid-feeling board & I really like the dedicated media controls on it, especially the volume wheel, pause & mute button! They are very convenient compared to many of the other high-end boards that you have to hit a function key+ to achieve the same.
Two very minor gripes - It's fairly high, so you might want to have a small wrist rest.(although I'd never want the one like on the G910) I got used to it just fine without any rest at all.
The other beef is that there seems to be a little hollow resonance that comes from the mechanicals under certain keys as you type, especially from the space bar. If you're listening to music, or working in a non-quiet environment, you likely won't notice it as you type, but it may bother some in a perfectly quiet setting.
It's not enough to make me change my mind about it, though - I really like this keyboard! The LGS software add-on does a good job of letting you customize your key-colors, & you can even scan for games located on your hard drive & it will auto-load an appropriate keycolor map from its extensive game profile library to give you a quick leg up on customizing your colors. Or, you can create your own profiles from scratch. You can pretty much do anything you want to the keys, including per-profile individual key color control. Overall, there's a lot to like about this keyboard, & the LGS gives you unlimited customization possibilities.