This headline is sensationalist. There are some problems, obviously, but if it were really that bad, then there would be a whole bunch more. I upgraded from 10.

This headline is sensationalist. There are some problems, obviously, but if it were really that bad, then there would be a whole bunch more. I upgraded from 10.5 and CS4, and have not run into a single issue. I tried everything that the users report in this thread as crashing Photoshop, and it's stable for me. Not one crash. One user reported that on a clean install with CS4, everything went smoothly. That, to me, says some people have stuff running that is causing problems. I had issues with system stability after the upgrade. Lot's of beachballing. Turned out to be a kernel extension that I was using in Leopard. Hardly surprising that a rogue kernel extension can make your system unstable. After removing it, SL has been rock solid.