I know a LOT of guys up there including the director of ops, director of training, and several pilots. From a semi-outsiders point of view, its a great place to work. Very good training for the aircraft. They have one of two sims for the Shorts. Huge MX department which works on Shorts from many operators, and knows what they're doing. They also have a huge parts inventory, and when something breaks, it'll be fixed the next time you get in the airplane. When Bombardier wants to look at something on the SD3 series, they go to Milwaukee and get the info from Air Cargo.
Its also a professionally run company. They have contracts with UPS, Airborne, and I think DHL. They also do some on-demand stuff. I definately recommend the company, and would work for them myself if given the chance (and didn't have to cough up money for training).