RacerTex: I came very close to buying the Corally 12M, but changed my mind at the last minute. I was concerned about the availability of parts, and the proprietary wheels used on the Corally car. I would need to special order any broken parts, and stockpile extra wheels in the event of a chunk, since my LHS doesn't carry the Corally wheels. Another concern for me was support. I contacted Corally, but at this point they do not have any setup information for the the 12M. This would mean that I would be on my own in determining what setup would be required for this car.
I ended up trading my new XXX-S for a new SpeedMerchant. On the SpeedMerhcant about 85% of the parts are Associated, and the wheels are easy to find. These same advantages apply to the Carpet Knife.