Last summer I flew HPX on a Mesa CRJ PHX-EUG-PHX. Phoenix-Eugene is probably one of the longest CRJ flights in the Mesa system... probably close behind PHX-DSM and PHX-ICT. I found the service to be excellent, certainly better than what I was getting on mainline at the time. Groundgrew was very helpful and personable. And the f/a's on both segments were VERY friendly and easy to get along with. The interiors of the CRJs are rather bland though. White walls and gray leather seats, I suppose it could be dolled up a bit. Overall I had a good experience w/ Mesa.
Stop drop and roll will not save you in hell. --- seen on a church marque in rural Virginia