you could get the cheaper ones off prothe's site and get the tops coated with a heat reflective coating, and the skirts with an anti friction coating... all this at LESS than OEM pistons :wink:
www.dieselvw.comthe OEM brand is probably cast a bit better, but who knows? there should be a review board on that site so people can give feedback on the different products. the only thing im really skeptical of on that site, is possibly some gaskets, and the timing belt tensioners. this is mainly due to a lot of people having very premature failure of the tensioners, destroying their engines (saving $20-40 on a tensioner, but having to spend over $500 for new valves, HG, head bolts, etc)