They've been around for a few yrs, the fella that originated them, then Inline started selling them, the Forster got into them. Haven't quite sorted out for sure which ones are causing issues, or if it is all 3 versions. There is a fair sized post in the FB Forster Co-Ax group about, what I think, may just be the Forster ones, haven't seen enough on it, to to figure it all out yet. And of course, read about that, the morning after install, needed an addon to make an order for other stuff worthwhile, so, broke down and bought the Forster ones. Meh.