I loved my PE on my e92. One of the best single "mod" that I did on the car. I don't particular like really loud and obnoxious exhausts; but I did want a little racier sound than the stock exhaust. The BMW PE fits this criteria. Love the raspy sound as well as the "burble" noise. I am not saying that it's better than other aftermarket exhausts, but for me, it was a relatively easy decision. No issue with warranty either. The ONLY complaint I had with the PE was the size of the tips. Slightly larger tips to fill the diffuser wells better would've been nice. But, they can easily be replaced.
'09 e90 AW 335i M-sport
BMW PPK 1 / BMW Perf. Exhaust and Gloss black grilles / 19" BMW 313 Perf. wheels / BMW Perf. aero side skirts and rear diffuser