I've flashed the 2.1 build and my early reviews are that it really is more or less stable. There are known issues with keyboard blacklight and possible GPS issues but those are being worked on. For the most part, it's mostly some UI updates, new gallery app which is slick, and new news/weather app. To me, the home launcher is awesome and I've ditched home++ since using this. I used to also use dxtop but again, this home launcher as mostly everything (except ability to use home in landscape mode). The app drawer has UI has changed and it's really just a much slicker looking thing, eye candy, but cool nonetheless. You now get 5 home screens and also the ability to long press bottom of the screen to pull up quick tabs to quickly jump to any screen. Live wallpaper support was not handled in this build, but a few people have posted "fixes" to get some things working, however these fixes have caused other bugs - for me I'm not even looking for live wallpapers so this is a non issue.
For me, the only real issues you'll see in this build are that it seems to have been designed for a phone without a physical keyboard, so we get the keyboard backlight bug and landscape mode on homescreen when using this keyboard has some UI flaws. I believe all of these are fixable.
Anyways thats my review for now. I cannot speak for any of the functional issues that people may hve with 2.0.1.