Thorley Headers any Good?

A guy by me is selling a brand new (still in the original packing) Doug Thorley Header system. Includes Headers, Y pipe and highflow cat. Said he paid over $450 for it. Wants $275! Checked out their website most of their systems are $400-$500. What do you guys think? Sounds pretty sweet to me!!!!!
Karpo

1995 GMC Z71
K&N Filter
Removed Silencer
Cat Back Ehxaust

Comming Soon:
CFM Tech Spacer
Injector spacer
Hypertech Power Charger
185* Stat