I've got multiple customers with them who ordered from SDP direct and none of them have had a lick of issues in many years. Scott also is relatively local to him. Maybe amazing isn't the 100% best term but he builds a solid trans that I do not personally believe will give him an issue.
I have had a few of Scott’s transmissions current one has been 11.06 at 127 in a 6800lb truck. Truck pulls a fifth wheel trailer to the track unhooks and races, has well over a 150 passes most 11.5 or faster. Scott’s allison’s may leave something on the table in an all out competition platform but as far as dependability is concerned they’ve been great. That being said I’m going a different direction with my next transmission but that’s just because I am going to a more competition based unit.