With all due respect, that video review is idiotic. Half that review takes place under harsh sunlight. You can't even see the guy's eyes. I wouldn't expect it to find an eye, it resorts to FD just fine. Then the other half he's inside and it pretty much works perfectly unless he's doing something you'd never do..."look what happens when i cover my whole face except my eyes! it messes up!" Then it tracks his eye just fine. "What happens when i put finger under my eye? It messes up?" "No it's still working..." "How bout when i cover my eye like a pirate?" Yeah...why are you doing that?
I used it on a Senior girl shoot yesterday. I was elated. Continuous Focus, Servo Mode, and used Eye AF or FD the whole shoot. Worked like a charm. My only gripe is the one I had before the firmware update. If I'm using FD or Eye-AF, and stop shooting for a minute, then come back to the subject, it often won't start tracking again. I have to choose a diff focus method and then choose FD again...or sometimes I can get it by touch and dragging to the focus point. It is annoying...but otherwise...it works.
Oh and he's using a Tamron lens. Which BTW, i was using a Tamron 85 1.8 and Sigma 105 1.4 myself yesterday with no issues. But if im doing a youtube video review, id prob be sure to try and use some native glass. And then maybe actually take some pictures and look and see what's actually in focus or not.