First off, I'm not an expert, by any stretch of the imagination.
Secondly, @Barney12's problems are well documented here, as are those experienced by @Eileen, so there are at least three members here who've experienced some problems/issues with their Sunamps. I think that @readiescards may also have had a unit replaced by Sunamp. I think we may have around half a dozen or so members that have the newer model Sunamps, so it would seem that perhaps 50% of them, maybe more, have experienced some problems.