The only "problems" I've encountered were probably errors on my part. After the installation, I unplugged the cord to the charger BEFORE the phone had completely rebooted. When I got to the GingerBlur desktop (I was coming from GingerGrey), I found that I had no access to CWM Recovery and had lost the ability to sideload apps of Unknown Origin. For the first problem, I simply clicked on Install Recovery in the System Recovery app in the drawer. It reinstalled, and I was good to go. For the second problem (side-loading), I ended up downloading an app from the Market which was a one-click app the reinstalled the ability to install non-market apps.
As I said above, I think that both problems were caused by my pulling the plug on the charger *before* it had completed rebooting. Dumbness on my part, as I *know* better than to do something like that. All in all, GingerBlur v3.5 is a pretty good Atrix rom.
-Mike