I don't think this is a correct characterization of the DuraVent Pro product. "Most" people do well with it. Every pipe has problems if not installed correctly - including the awesome, magical, mystical, impossibly wonderful Excel - as a poster last week notedHoverfly said:Also I would stay away from the Durvent as most people have problems with it.
Properly installed, DuraVent Pro is a fine product, works well, and is completely acceptable for safe use in corn & pellet stoves. It is the leading vent product in the industry now. It's not that because it doesn't work.
As they say, YMMV.