I got mine a week or so ago and immediately:

- flashed it to 2006 OS beta to try. Liked it but needed some of the 2005 OS only hacks so I
- reflashed to 2005 OS
- flashed to turn on R&D mode, did changes so I could gain root even without R&D mode
- flashed to turn off R&D mode

... have since booted and rebooted many times and have had no problems... yet, at least.