Looks like a good deal. We're just in the process of getting our little beastlets ready for the microchallenge, will you be entering? I'm looking forward to it, although I highly doubt that my driving skills will be any better for the little beast than with the B4, should be fun though.
I fancy taking mine down to the Batley outdoor track sometime to see how it goes, seeing as I have only tested it on the kitchen floor so far.