I've got the cat'ed version of the UPR X-pipe, myself. Other than the obnoxious and ongoing fitment issues I've had from Day 1 - hangs too low, keeps sagging in the middle, extended things about 1" back so that my tailpipes will never fit right without banging/rubbing against the undercarriage (almost burned through my fuel line!), and so on - the sound that it puts out, though, is GREAT.
Going to be going with a Jeg's off-road X-pipe as my daily-driver exhaust sometime in spring, and keeping the UPR junk piece strictly for smog testing. Far as I'm concerned, all X's pretty much sound the same - it's the H-versus-X-versus-Prochamber difference where you can really tell a major change in tones.