It looks like nothing more than "engine restorer". A "stop-gap", if you will. There is or was(?) a product for fullsize engines that did the same thing, but, it's not an "end-all, cure-all". On fullsized engines, it did help and was considerably cheaper than rebuilding. For RC, if your engine needs to be rebuilt, then it needs to be rebuilt, there's no way around it. As for being a gimmick, I don't think it's a gimmick, except for something else to spend money on.