Uh, I have been burning pellets for eight years now, have done three installs and all of the pipe came from hearth shops. Three separate shops, in fact. I wish I had taken a picture of one piece...they tried to put RTV on an inside seam, but missed....by an INCH! Guess an OJ simpson worker had a few too many at lunch. Another one had a rivet that you could see light coming through. It blows my mind that we can seal pressurized gas lines well enough that they don't leak, but simpson can't make pellet pipe that handles the relatively low pressure of a pellet exhaust. Oh yeah, the guy that told me that simpson is crap is the biggest hearth shop in Maryland. He stopped selling it because it was causing too much trouble for his installers and customers.