I would suggest for anyone who hasn't tried this yet because they're afraid or because you're waiting for 2.0+ to go ahead and do it... The speed is just ridiculous. There is no more 1 or 2 second delay to open messages, apps, videos, etc. Literally no delay and i'm not exaggerating.
As long as you have ADB setup then there is no risk in doing this... all it modifies is the /system folder (which is the OS) your BOOT partition stays the way it is so if you screw up you can always flash back your original software.
There is no chance of bricking your phone.
I have no issues what so ever with the new firmware. Speed is incredible and everything works. The 1 thing that doesn't work is Vibration. Everything else is fine. I even noticed a speed improvement when downloading/installing apps from the market.
Here is a guide to getting ADB to work:
MyHangoutOnline - Tutorials, Downloads, Roms and More.
Here are the Behold II drivers for Windows (not necessary for linux, mac):
MyHangoutOnline - Tutorials, Downloads, Roms and More.
Once you have that setup just open a command prompt window (plug in your phone to computer) and type: adb devices
If you're device is listed then you're ready to go!
Follow the instructions on the first post and you'll be good to go. The only thing i recommend is, do a FACTORY RESET BEFORE AND AFTER the instructions.