One piece of advice I'll pass along is to do updates often...and then double-check it after each update.
The last time I used my 5700 Elite w/ AB at a rimfire PRS match, I updated it the night before. When I went to enter dope for each stage, it went from 8.1 mils at 212 yards to 32.5 mils at 213 yards. I tried turning it off several times and I made sure that Bluetooth was turned off and that it was pulling the correct profile for the Vudoo I was shooting.
No matter what I did, that was the result. I asked Kestrel about it on Snipershide and their only suggestion was to try updating it again. When I asked what would cause an update to do this, they replied that sometimes, things like that happen.
I think they're an amazing tool, just make sure you check it before using it in the field after updates.