Thats the one I was looking at, I heard a couple people say they dropped it and it broke fairly easy or the button popped off though. If its not any more durable than the spinner or twist than I might as well just grab a spinner or a twist. Thats my biggest concern.
I was just in a B&M a couple hours ago checking these out - guy behind the counter says they've been flying off the shelves - he's only charging $50 and covering sales tax, which I think is a bargain when it's "only" 20% cheaper at fasttech (same guy sells Evods for $13). And they're the same size as a standard 900 battery, maybe 1/2" longer and 1/8" wider at most.
This is what I'm leaning toward when I go vv (still on standard Egos now, just tried a twist for the first time today and was blown away), but I'm a couple months out from any more purchases. Will follow discussions on the 3.0's durability with interest...