I can only comment from personal experience; I fly with Revos. Not sure if you can get the prescription lenses though.
I find them great to increase contrast in almost any weather conditions. They are polarised, but I've never had any problems reading instruments. Granted they may cause a problem reading LCD instruments, but for me, that's only the OAT/Clock in the 172 I fly and I don't remember having any difficulty with it.
Most models have thin legs, which don't upset the Noise reduction of headsets too much.
I guess it's all down to personal preference. One point to note: the metal frames might not be as drop resistant as plastic frames. I've dropped mine a few times
and have noticed that they are slightly warped. But then I suppose you can't really adjust the fit of plastic ones as easy as metal frames can you???
Cheers,
DB