All releases have disclaimers. A release from Nokia is a release from Nokia and I expect the darned thing to work. If a company releases a lemon with a note that says "Warning: may be a lemon" the all they have to do is tag all releases and to hell with it. There's a reason most don't install it, or custom kernels, or whatnot. I NEED the device day to day. Finally, the test base for leaked PR is minimal. Hundreds at most. Final PR wil run on a thousand more machines. This is akin to saying a war is safe because 200 made it back. You have too small of a sample, and sample bias because people who risk it have some knowledge, some adventure and some understanding of risk involved. A Public Release is, as the name suggests, public.