I have a Sony A3000 that I have calibrated using Avia. After initially calibrating it, I was happy with the PQ.............for about 2 months. Things didn't look quite as good as before, so I put Avia in again and had to make some minor adjustments, but it's back to looking great again. My guess is that some drifting takes place and that it is a good idea to go in and check your calibration settings every month or two.

Just an FYI.