Pros
I worked at GDMS for a very short time (<1yr), but really loved how employees got treated there. Management really tried hard to keep employees happy. GDMS is located in Scottsdale, which is in the nicer part of Phoenix. 9/80 work schedule which allows you to take every other Friday off. The "decompression room" has nice big screen TV, with X-box and Playstation along with pingpong table and foosball table. 401k matching up to 4.5%. Nice small perks like paying $150 toward your gym membership and free Valley Metro card allowing you to take buses and light rails at no cost.
Cons
The company can't seem to win any work contracts. Maybe marketing department needs to step up their level. Due to this, your job might not be very stable. Engineering tools (SW/HW) and workstations are a bit dated, not keeping up with the outside world.