I have one. Somewhere in the garage now. Someone else asked about it a while back and I'll tell you what I told him.
The fit & finish was nice. No complaints with the slip-on at all. And it helped get rid of the ugly stock slip-on portion of the exhaust. But it didn't really do much for sound. The cat under the bike just chokes out all the sound. The muffler doesn't really do much, so changing it doesn't affect much.
But it's a good product.
Eventually I went with a full Arrow exhaust. There's sound now.
Playing with PC5 A/T mapping
Arrow Evo exhaust, PC5 Auto Tune, PAIR removal
OG 2010 Acid Green Pre-Orderer