yes, this guy is new, so the jury is out. I'm going to wait for someone else on AS to try them first. Are they Chinese parts or what? Will he stand behind them if they fail? I'd buy from Baileys if I wanted aftermarket pistons/rings - at least you have some recourse.
If you buy the cylinder/pistons sets from ls_quintos on Ebay - he is selling genuine Stihl stuff... Must have got a truck load a few years ago. I'm guessing Stihl or Mahle dumped (maybe to Russia?) large quantities of 026/36 parts (and a few others) when they changed the cylinders on the 26 and stopped production on the MS360. The parts were then shipped back to the USA. I've used plenty of them, and they are real nice...