The "nano-tech" batteries are just as hit or miss as any of the hobbyking batteries.
Zippy, turnigy, rhino, nano-tech whatever. Basic rules apply, the biggest mah you can fit and the highest "c" you can afford.
I've got a growing pile of DOA and puffed hobbyking batteries. I'd still rather take my chances than pay for "premium" batteries. My last hobbyking order was over $400
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.
I'll be in the market for a few lipos this Spring and I'll be going with Gens Ace. That is for a 500 sized heli. I read sooo many positive feedback about them that I am not even considering Turnigy. Even though the ones I have are good. I had a few Nanopuffs. Not going to get those for any application.