I tried what is essentially the RTM build today. It worked fantastically until I couldn't refresh (it failed), a clean install revealed it had failed to store the key in the BIOS like it should have, so I couldn't activate since I didn't pull the key after the upgrade but before the clean install attempt, and after reinstalling 8.1, I couldn't even get it to upgrade anymore after it failed twice. Needless to say, I'm a little bit worried about launch day considering the build I used is what people will be upgrading to unless there are some last minute updates.
I'm going to wait. After spending all afternoon playing around with installs and finally resettling on 8.1, I just can't be bothered to deal with the classic day one OS problems. In the end, I only took the path I did because my 8.1 install was becoming problematic, but now that it's been clean installed again anyways, it's up to speed and working fine. I have no real reason to upgrade anymore.
