I've only had borla exhausts and I love them. I could never talk my wife into getting an LS2 GTO but my plan was to throw some shorties with a borla on that. The only negative is that the drone was pretty loud ('04 V6 tiburon). Besides, there probably won't be all that many people putting exhausts on their G8 so it's not like every other G8 you see is going to sound like yours.
Not to hijack the thread, but here's what my next car will sound like... 2010 hyundai genesis coupe (310 hp V6 RWD).