Well for one, I just like th looks of PVC a little but more. But mainly because they hold heat a lot better. My snakes got moved from my old snake room, which was basically a utility closet, to a spare bedroom. The spare room does not hold heat well enough for me to want to continue with the ARS rack, as well as the prices of the ARS racks themselves. The prices I'm not a huge fan of either. Granted I do like the ARS hatchling racks, mainly because of the tub size, than opposed to a 6qt hatchling rack; but even so I'm sure that can be custom made.