The 0.7.0 upgrade went smoothly for me as did the desktop app update.
I ran a few hour print tonight (bust of Batman) after updating to 0.7.0 - however, I used Cura and not the store.
It was one of the largest and best prints I've done yet I think.
I didn't notice any changes in the printing behavior overall.
Until I have control over settings like infill percentage and base raft/brim via the store, I have no reason to ever go back to using the store.
(as an aside, since I've been using a very thin brim, keeping the cover on and blue tape on the base, I've had zero problems with adhesion over 10+ prints!)
My only issue at this point is once in a while just after the initial head drop to the bed at the very start of the calibration process, the whole thing just stops. I usually crank up the head an inch manually and reload the gcode file and try again. It always works on the second try. I haven't been able to tell if it is a firmware issue or a problem with my start settings in Cura, but I suspect is is firmware because if it was the start settings, I'd be seeing the behavior for every print. This happened on my 0.7.0 print tonight so whatever it is, it is still there, but it is a minor inconvenience.
Chris