I'm sure guys are very happy at first. I loved my 135 job when they graciously offered all the line service guys interviews for right seat king air jobs at 300 hours. Those of us who passed took the jobs and loved it for about 400 hours. Once we started to realized that we were able to work elsewhere for much better pay and treatment we began to get frustrated.
Getting a jet job at 300 hours will make most people happy but as you watch other pilots doing the same job you do for much better money/upgrade times/work rules and treatment you may not see things the same way.
Instead of spending $6000 on a CRJ class, take 1000 dollars to a bar in Houston where XJT pilots go or Lofty's in SLC where SKW pilots drink. Buy drinks for every pilot in the bar and I'll bet your new found internal recs will be much more powerful than any CRJ course.
I watch Mesa sit in ORD during ground holds and thank god I held out for block or better. I see TSA guys parked next to their GoJet brothers wonder what it must feel like to watch those psuedo-scabs (not real scabs) from their point of view.