Upload & Sell: Off
I happened to have a quite good experience with the adaptall lenses. What started for me were the SP 17/3.5 and 24/2.5 that I used with my Konica Autoeflex T. I have since changed/used/collected so many different cameras, from maker to maker, from film to digital and they work perfectly on every of them ("versatile"). It's a very smart design in my opinion.
It's probably bad luck (or faith?) that you ran into a few that gave the you the bad impression about the entire line. I wholeheartedly suggest that you try some from the SP line. Many of them are excellent lenses.
A few that I like: SP 17/3.5, 24/2.5, SP 90/2.5 macro, SP 300/2.8, SP 24-48/3.5-3.8, SP 35-80/2.8-3.8, SP 70-150/2.8 softfocus, SP 70-210/3.5, SP 80-200/2.8
About adapters, they are very easy to find, from ebay to KEH. They even have knock off chinese made ones.