I'm one who bought early (end of October 2014) and have been back and forth and think I have a good copy. Originally I think most of my problems were operator error, and steep learning curve with the af, also, I don't give a poop about a photo unless focus is On Target so I changed all my servo case settings to reflect that -focus priority and don't fire unless you get focus, your darn camera. Once I did that, the only issues are my ability to tell the camera what I need.
In some respects, I think -as a group - those who want a 7D2 are more educated and understand how to test and get the best out of the camera vs those that would buy a 70D... So any manufacturing tolerances that aren't up to snuff are being ferreted out more.
I wouldn't hesitate to recommend the camera to anyone, with the byline that careful testing In Good Light is highly recommended if you like to see tack sharp at 100%. As noted, a purchase from a reputable dealer with a good return policy in the event of any issues is a smart move. JMHO.