I've been to AMH about 3 times so far this year.
Pros:
-Impressive facility, large spaces and adequate sized staff
-Compassionate and patient staff
-Will work up estimates and options for you if $ is an issue
Cons:
-Don't really have the best equipment for complicated internal issues
-Usually a wait (days) to have ultrasounds or x-rays done and not very precise
Overall, I think AMH is a great place to go if you have an after hours emergency that seems fairly simple. Too pricey to be your primary vet and too inadequate to deal with internal medicine or oncology issues.