Before lurking on these forums and knowing just how common clones and counterfeit devices actually were, I bought two Vision Spinner IIs from Ebay. They were from a Chinese seller and I was able to get two Vision Spinner IIs + two Protank knockoffs for a total of $29 (free international shipping). I actually ended up only paying $19 because the original listing only had one battery and I asked the seller if I could buy a second for $10 and he agreed, so I sent another $10 via Paypal. The seller ended up never claiming that $10 and it was restored back to my Paypal account.
The Vision Spinner IIs were undoubtedly counterfeit, especially considering the price I paid. However, they both still worked as good as could be expected... at first. They even had the color-changing LED to show battery life and the locking VV spinner.
The first thing I noticed was after about 3 weeks of use that the battery life was considerably shorter. When I first got it, it would last my whole work day plus most of the night... By week three, it would be dying right at the end of my work day. I was even charging it as soon as I could after the light turned yellow, as the manual suggested (my other egos I used them till they were dead).
Mine completely stopped working at about week 5. The light still lights up when you press the button, but it doesn't power the atomizer. I assume it's something with the connector. My girlfriend's is still working fine.
For the price I paid for two batteries and two tanks (along with replacement atomizers, extra drip tip, few extra random pieces) I really can't complain, when in reality I basically paid $5 for each item.