i have never tried one of these doubles... it looks like it would help with my breating troubles, without letting my jaw hang open... i picked up 2 other shock doc guards, but have not had the chance to fit them or try them out yet... i know protech is supposed to have some of the best.
I use Shockdoctor Gum Shield Pro and that works fine with me. i never liked the double mouthguards, it takes a while to get used to i guess. Shockdoctor provides the cover you need and fits good. Arent that expensive either