I think it is sad to see all the attacks on Jeff, as he has contributed a lot to this hobby, and without him we would not have access to insert decals. Seems he never gets the praise he deserves on Pinside.
I have been doing business with Jeff for over 10 years, have bought many insert decal sets, and can tell you that most of his artwork is spot on, and always printed on top quality material.
Most of the complaints I see in this thread are ridiculous, like the one about wax taking off the artwork. Jeff has two types of insert decals, one with artwork printed top side, and the other printed bottom side. The topside printing is intended to be clear coated over, so if you use these without clear coating and then apply wax, of course the petroleum products in the wax will take off the artwork.
Jeff can be hard to reach sometimes, but everyone gets busy at times.