My oldest nitro-finished PRS is a 2013. No wear or checking after 4 Michigan winters. Looks new. Same with the more recent nitro-finished ones.
I had a CU22 Soapbar from 1998-2014, and a 1992 or '93 Artist II for maybe 7 years. Both looked new when I sold them, and both sported the old poly finish. The CU22 Soapy also gigged with my son in several punk bands, and wasn't babied, yet still looked near-mint after 16 years. That finish is tough.
I think PRS nitro finishes wear very well, except obviously they may check if subjected to fast, extreme temperature changes, i.e., guitar comes in from freezing temperatures and case is opened in a warm building, etc.
One nice thing about the PRS nitro finishes, at least the ones I have, is that they're very hard, and don't get sticky in warm weather like other nitro finishes can. I expect them to hold up well for years...of course, you want to see ones that are more weathered, but...
I've got no wear on the V12 finishes I have here, either, but they're fairly new. However, there weren't any issues with previous V12 finishes I had, either.