I work in an open office and my coworkers asked me to take my mechanical home (brown switches). I think it all depends on how tolerant your coworkers are.
Edit: if you're careful not to bottom out, then it isn't so bad. O-rings can help dampen the sound otherwise.
Your coworkers must be really sensitive (or mine are really tolerant). I've used brown switches in a Filco Majestouch for over a year, never had any complaints. I don't bottom out the keys, but there's a noticeable clack when the keys come back up to full extension.
IOW, I don't think brown keys are unreasonable for shared work environments; they're not much louder than a standard Dell rubber-domed KB.
The blue switches in my DasKeyboard at home however... I think I'll have to upgrade just to get something a bit quieter.
