I watched the online class today. The demonstration reinforced my belief that the planer jig is capable of good work in experienced hands. It seems well suited to a sharpener who does a lot of specialized planer blade sharpening or who is blessed with a generous amount of natural talent.
It was not mentioned in the demonstration; however, the jig can also handle jointer blades and miter trimmer blades such as the Lion Trimmer. Framing stores sometimes don't keep their Lion Trimmer blades (there are two) sharp. The giveaway is ragged frame miters. With the planer jig, these are easily sharpened and a good potential source of reoccurring business for an enterprising sharpener.
With either the planer jig or the TT-50, there is no learning substitute for hands on practice.
Ken