For less than the price of those retro kits you can get a new FugeRay that's much better looking.
I agree but I do think this has it's place. I really considered this for an existing PC fixture I already had. It's just an easy way to take advantage of something you have with minimal effort. The other aspect is these came about before the Fugeray's as well. I would likely only consider this if I had an ADA PC fixture at this point.