Just posting to share my experience.
I was in need of a quieter keyboard than my trusty Cherry MX-Brown (with rubber O-rings that I added last year in an attempt to get them quieter) that I've been using for 10+ years now, so I got a Logitech G512 with the new Romer-G "tactile" switches made by Omron in conjunction with Logitech. While the manufacturer gives me confidence that the switches might last as long as the Cherry MX-Brown switches in the keyboard I'm semi-retiring, they feel significantly "mushier".
I guess that's the trade-off for a quieter keyboard. The keys are supposed to be similar to the Cherry MX-Brown, and that might be true, but due to the mushy feel, they don't feel at all similar. Typing is less satisfying, although they certainly are a lot quieter. I guess that's a consequence of whatever they are doing to prevent you from bottoming out on the keys.
The most important thing, however, is that they seem to have the accuracy of a good mechanical switch. So, while typing is significantly less satisfying, I can type at a similar, albeit slightly slower, speed than the Cherry MX-Browns without additional errors as I do when using a rubber dome keyboard.
If I had a choice and didn't absolutely need a quieter keyboard, this would be getting returned to the store immediately. I have a feeling my fingers are going to also be significantly more fatigued after extended use as well, I can already feel it. But perhaps with time, my fingers will adjust as these switches are supposed to require less travel to actuate.
Also, one gripe, if you turn off key illumination entirely (what I prefer) then you can't see the key labels as they use a clear rather than white translucent material for they key labels. /sigh.
Regards,
SB