Caution when buying from eBay
Also, this thing sucks batteries so try to get the AC adapter!
The VB is a fun toy to play with but truth be told it is still just a toy, and rather gimmicky. You will most likely get tired of playing it quickly. At least it is better than the Tiger R-Zone. Anyone else remember that POS?
As far as battery life goes, I never had the battery box. If you can't find an AC adapter, at least find the AC Tap. The adapter is the same as was used on the Super NES (original version, anyway, I don't know if they used it on the new one).