If I'm not mistaken, any "glitches" would be in the firmware anyway...and an update would take care of it. I have the 2016, and love it. I just got back from a vacation and the apex saved my entire system. My AC unit kicked a breaker and the only way I knew it was because my tank temps were rising. Checking the apex, everything was working as it should. My fan was on and everything. This is how I knew there was a problem, and I was able to get a friend to go check on it while I was gone. All together, I lost one cheap sps frag, and that might just be a coincidence.
My advice...buy this thing. They're awesome!! If I had another system, I would buy this one myself.