Zotac Amp 900 series OC any issue?

980TI is finally out and we have seen vendors like Zotac, EVGA, Gigabyte push out their best cards. I have a friend who is very interested in buying a Zotac AMP GTX 980TI, however, I have heard that Zotac AMP have OC issues ranging from bad VRM cooling or locked voltage etc.

However, I can't really find the issues on Google as they are pretty much flooded by reviews. Did anyone had experience with these Zotac cards? I would love to have Logan here as Logan had reviewed the GTX 980 of Zotac and I didn't hear him saying anything about OC issues.