Sorta, twice. I had performance issues, tried to do a restart, through the on-screen controls, not 3-finger. When it finally shut down, it would only give a double flash of the LED until I connected it back to DM and then it loaded the OS1 and then added another update to bring it up to the current official OS.
I was able to restore my backup I did from before the upgrade, so I didn't lose too much, but the last time, I did lose a bunch of cool pics I had just taken.
I'm still very tempted to update to 2.0 again and seeing all of these awesome vids of the official one has me conflicted. I think I'm going to wait but it's going to be hard.