Having read through most of these threads, trying to make a decision between Mesa, Whiskey and possibly CommutAir (others have been considered and discarded for variety of reasons):

It seems all have a variety of pros & cons (if I take comments at face value). As far as the pros of Mesa (since I'm on the Mesa APC feed):

Quick upgrade time on the CRJ
Max flying
United and American contracts (but for how long on each)?

Cons:

Sub optimal reputation
Sub optimal instruction
Sub optimal QOL

I think I have relative confirmation of the cons and I'm looking to confirm validity of my assumed pros.