http://www.rc-monster.com/forum/showthread.php?t=5991
I saw this a couple weeks ago. Was wondering how it would perform myself. Looks interesting at the least. The biggest issue I see is if you need to vary gearing for any reason, the only options you have is to change the motor for a different kv or go with different size tires.
It appears to run decent in the video, but somehow it just looks a litlle hokey to me. If you decide to give it a try let us know how it works for you. I'd for sure be interested to hear about it.