Just saw this while browsing through ebay. I bought one last week for $466 which was a good deal at the time but now can be had cheaper through another eBay store.
In before the 'this is illegal in [insert state here]' please check your local laws around the use of this.
Fairly happy with mine so far. Build quality is great. Can't comment on distance yet as I haven't taken it from full to empty but it is rated for up to 25km on a single charge.
Don't buy if it if you want it to last more than 2 or 3 charges. The controller board on these are screwed. Do some googling before you end up with a useless paperweight.