Experience with Enginetech’s Master Kit for engine revision, eg Ford FE 390

Hello all, I was offered a engine overhaul kit by Enginetech on the search for Ford FE. At google I came across offers on eBay. Since the prices there are very cheap (except the postage) makes me doubt the quality. Here’s my question. Has anyone here ever had experience with the quality of these kits from Enginetech and how was the…? Greetings and Happy Easter Thomas