I took American Supercamp (based out of Colorado) and want to do Cornerspin as well.
As for the price, it's the best money you will spend. American Supercamp is $650. Cornerspin is a bargain comparatively.
Tail of the Dragon at Deal's Gap... Avoid it now, do a trackday.
Do not do business with Myrtle West Cycle... Not a reputable vendor by a long shot.