James: I'm in a similar position - some wireless hardware (like my Canon printer) work fine. Other stuff, like the main Windows PC, kept dropping connection. So I went to PLE to get around this - and it worked fine for a while. Then I started get a problem where a particular client adaptor (one connected to the PC's, rather than the "server" adaptor connected to the router) would fail and I'd have to swap in a spare. Then, when after a couple of days the "spare" would fail, I could swap in the old adaptor which would work fine ... for a couple of days.
Eventually I got tired of this "musical chairs" and switched from Solwise PL-200's to Devolo AVsmart+ adapters, which have proven to be 100% reliable, although strangely enough, slightly slower than the Solwise ones. I wonder if these new Netgear adaptors have the musical chair "feature" or are Devolo-reliable?
But then again, someone's bound to point out that ALL PLE adaptors are the spawn of the devil because of the havoc they wreak on radio hobbyists.