Pros
I worked for AVISPL for 5+ years in the NY Metro area. Best thing I can say from my experience is that I worked with some really nice, intelligent, and talented people - unfortunately, not enough of them to compensate for the ineptitude, inexperience, irresponsibility and outright laziness of the majority.
Cons
All departments worked in a constant state of "red alert", caused by numerous factors, including lack of standardized procedures, incomplete documentation and poor document control, and insufficient resources. Salaries were generally below industry standards. There were no regularly scheduled performance reviews & salary increases were few and insufficient. On the other hand, due to the "red alert" environment, there was always plenty of overtime to be had, which was fine if you were an hourly employee.