I guess I'm lucky, all of mine seem solid and locked in both in atti and gps mode. Then again it would be hard to tell if they were off a bit, it's rarely if ever completely windless here so there's always some amount of movement regardless...
Got several good flights in with the TBS Disco/Naza on Saturday morning, did a couple with the QAV500/Naza as well. Had two chances to test how well RTH works with the QAV, twice I lost the video, just went to static suddenly. Once was close enough to see it but not to fly it back LOS, the second time it was close to a half mile away and well out of sight. The second time as soon as the video went to static I hit the throttle to climb out knowing I was only about 15 or 20 feet off the deck when I lost video then after a few seconds flipped the switch to activate failsafe. Had a minute or two of angst waiting to see it coming in and then there it was flying a nice straight line back to the takeoff point. Now I need to track down the loose connection on the QAV that's causing the video to drop out and I won't have to hit the failsafe switch again.
Nice to know you can rely on things like that to work, I think I'll wait a while before I upgrade the firmware as well, right now I know what I have and that it works 100%!
Ken