Man, I hope that company has good liability insurance. That looks like a ready-made annuity for trial lawyers! There is no way I would put one of those on a customers bike. If you really need disc brakes have a reputable framebuilder braze or weld on the proper fittings. Brakes are too important to do half-assed.

I also agree that except for constantly riding in muddy or wet conditions, front only discs will give you all the power you need. Rear brakes lock easily enough as it is.