anybody know anything about this brushless setup

[tashpop]

sorry if im bringing up an old topic here, but i'm wondering about this brushless set up i came across on ebay.

http://cgi.ebay.com/New-E-maxx-Brush...QQcmdZViewItem





maybe not so much the moter being used, but the method. i haven't ran across this type of mod since i got an emaxx and started upgrading and i want to know if this is any good or am i better off sticking with a spur/pinion setup with slipper. any info on this would be helpful.