I have a Pacesetter catback on my daily driver/beater and it has lasted almost three years. The Pacesetter aluminized piping is nearing the end of its useful life due to rotting (winter driving = road salt/corrosion). I don't think you'll suffer from that problem down in GA, but it's just something to keep in mind...
i didn't know they were making products for 4.6's. I had Pacesetter header and exhaust on my old rx7 and the stuff was ok. Wasn't stainless so don't know how long it lasted...held up nicely while I had it and sounded great even on a rotary.
Used one of their OR h's on a 5.0 for bout 12 years. Is the quality = to some of the more pricey stuff not really but for the price it gets the job done.