It's faster. It's prettier. It allows you to easily step over into 3D views of stuff. I'm very tempted. But:
1. I have to relearn a thousand instinctive habits (although age 62.5, I think I can manage this - it will help keep me young).
2. Can't share mxd's with colleagues still on ArcMAP (don't do that very often anyway).
3. Fear and trembling that a bug with no easy work-around will stop me in my tracks (Pro 1.0 and 1.1 were like this).
Can't afford to spend a week learning, only to find out the beast is not ready for prime time. What say other analysts who may have run Pro 1.2 around the track a few times?