Fresh out of the box:
Welds seem to be fairly clean, especially considering the price (~$100 shipped)
Tip, not coffee can sized ftw.
I've had this installed on my car for about 3 months now. I don't have much to compare it to other than the exhaust that was on my car when I bought it. I used to have a cheap "N1" style muffler with a coffee can sized tip on in, OEM cat, DC header, and 2.5" stainless piping. Damn was it loud...all the time. It had a nasty habit of resonating a very unpleasant exhaust note inside the cabin of the car between 3200 to about 3600 rpm. Care to guess was rpm range I cruise in 90% of the time? Eventually it got to the point that I couldn't stand it anymore, so I opted for the OBX.
The OBX is a vast improvement over what I had, and it was only about $100. I'm still not going sneak up on anybody in my car, but the volume level when putting around town is tolerable. When I stand on it, that's a different story though. It's still pretty loud during high rpm acceleration.
The only issue I've had with it was convincing the service writer at the muffler shop that it would fit. The look on his face when I took the muffler out of the box as showed it to him was worth the $100 pricetag alone. He had never seen anything like it and I had to explain how it was supposed to be welded on. Eventually I ended up with a new custom axle-back welded on to my existing cat-back piping so that the muffler wouldn't hang too low.