I've been with Compass for around 2 months. I was a CFI for a year after graduating a 141 program and got hired at 975 hours. I finished instructing with 1001 before going to the ATP CTP course.
When I was hired I got a class date immediately, a friend of mine who got an offer earlier this month got a class date in September so I would recommend interviewing early, your offer is good for 6 months. At the interview they told me they could take you 25 hours shy of your ATP requirement.
So far no big complaints. The HR side of things is quite disorganized and expect to get your flights/hotels the day before or day of only after emailing someone constantly.
Training is going great. Every instructor I've had has been awesome. The training is the typical firehouse you hear about but not terribly difficult. The firehouse doesn't start until week 2 with the FMS programming.
My recommendation is to have the preflight flows memorized by the SITs and have been working pretty heavily on the other flows too. Memory items should also be pretty much memorized by the 2nd SIT.
By the FPTs you need to be able to do the flows by memory with occasional screw ups you can ask for help with. The FPTs just changed recently and the new training outline is much easier I hear, but guys are still unsating them and being held back. They will not spoon feed you. They will expect you to show up for your 1st FPT having done a lot of the ground work learning the flows and callouts.
The first 2 weeks of training are consecutive, then you typically get a week off. 1 week back on for SITs then another week off. This seems to be the pattern across the board because of a lack of instructors and IPT/sim availability but I'm not complaining.
Training events are spread out between Minneapolis, Dallas, and St Louis for now since there are a lot of us in training at the moment.
Overall great place to be. All the people I've met are fun, funny, and there's a real family vibe within the workgroup. The jumpseat observations were a ton of fun and I am super excited to fly the guys on the line.