Pros
Overall HAECO is a great place to work. There are plenty of great people there, and if you work hard and do your job correctly you will do very well there. They provide lots of training, Fam courses on Aircraft etc. Some of the best training of any company I've worked for in my 10 years in aviation. There is plenty of room for vertical growth within the company if you want it. They provide pretty decent benefits. The work was interesting and pretty enjoyable for the most part. I likely would have stayed there if it weren't for reasons outside of work that caused me to move.
Cons
Pay. Plain and simple they don't pay nearly as well as other A&P positions in the industry, or really even just in the Greensboro area. It's much better than it was 10 years ago but they still have room to go to be competitive. They have a lot of great mechanics come through their doors but they don't stay long because the pay isn't there. Some aircraft lines were much better to work for than others. I got lucky and landed with a crew that worked great together. Other people were not as lucky and therefore not as happy.