I keep tabs every now and then. It keeps me youthful.
I'm happy and proud be a keyboard warrior steering people away from CommutAir. I wish people had done the same for me, it's a year of my life I can't get back. I'm sure some things have improved, and I saw some things improve while I was there... but I still have several friends there who tell me the actual truths. And let's be certain, the contract, which is deplorable, has not changed at all.
As far as instructors being safe, I'll spare the details on a public forum, but lets say I saw the worst flying in my entire career with a couple instructors there... bad enough that the FAA was involved. It was a major factor in leaving.

Folks considering C5, just please do this for me: Talk to ANYONE who worked at CommutAir and then another regional. Ask them which was better. Or ask someone who worked at a different regional before C5.
I won't tell you what their answer will be, but that should help you make up your mind. The people that continually defend C5, and I know a few of them personally, have never worked at any other 121 in their life. They have no perspective of how an airline can actually be run.

Cheers.