I don't have any experience with the choppers, but I've thought abut getting one myself. You can save yourself some money and get one from 3 Rivers Archery. Both 3 Rivers and Keystone have reasonable prices on shield cut feathers.....I prefer them over parabolic simply for asthetic appeal. Keystone isn't all that far from you and Cabelas has 'some' shields too.

www.keystonecountrystore.com
www.3riversarchery.com