STS Turbos -
It seems people either love them or hate them, no "grey" area here.
My neighbor down the road had an 04 GTO with an STS kit. Made 487 RWHP. Ran it for years, never a problem.
But then it sounds like blackedout010's buddies had it and it didn't work out for them, so that's not a good thing.
There are pros and cons with anything. Pick what you like and go with it.