I flew at Great Lakes. I had 850 TT when hired. I spent a little over a year there. I left with 1850 TT, a type rating and an ATP. The pay has improved, the company is still horrible. You will walk out a better pilot and with the requirements met for an airline career. Get in, get your time and leave. There are very few responding who have flown there. PM me if you have any questions. Remember, just because it's a sh!tty place to work, doesnt mean you will make it through the sim. Good luck!

Just out of curiosity, do you have your ATP written completed? If not, that is an obstacle in your very near future. Is GLA offering the CTP course?
Are you eligible for a Restricted ATP?