Pros
The fast growth means lots of new and different project opportunities that are often available to many of the employees. If an employee works hard and is successful, they are rewarded with their choice of new project opportunities. In general the project managers I've had contact with have great management and people skills and they establish a positive rapport with the team. The COO is a hardworking, very smart guy that appreciates good employees and recognizes motivated employees that produce good, quality results.
Cons
Communication can be very poor and decisions on anything can be very slow from senior management. The back office support (accounting, contracts, HR, etc.) seem disorganized, unfriendly and unresponsive (especially the VP of Finance) to requests from employees. The entire organization of the company is a little unclear as there are several individuals with a great deal of responsibility (including the COO), but little public recognition of the hard work. The CEO seems to have no apparent responsibilty for anything.