Summit exhaust systems, are they decent?

I have been searching through summit's catalog and see that they make a 2.5" and 3" exhaust system for A bodys and i was wondering if these are a decent exhaust system? Do they sound good? Are they good quality? I have really wanted to buy a complete exhaust system instead of piecing together different parts. Do you guys know of any other companies that make complete exhaust systems for A bodies? Thanks for you opinions i don't wanna buy the wrong thing.