Got the Dual Drive installed
and it makes a world of difference. Now have 81 gears and can crawl up a hill like a billy goat. I am quite pleased with it after my initial ride. It does make a strange noise in the big gear, sort of train track sound. I have read a bit about that but can't recall where and don't remember it being unusual. It doesn't really sound like anything is wrong, just noisy.
The one and only thing I have found I don't like so far is that I will have to carry a 15mm spanner with now to remove the back tire. The QR is lost on this setup. Minor inconvenience so far as I can tell, and if that is all I have to 'gripe' about it will be good.