Sorry, Gary, I can't really help either, although I am presently looking at either the William Optics or Stellarvue units. I think Frontier Optics sell some Denk binoviewers, and although I guess you don't necessarily want to trust a vendor's opinion, Daniel at FO is pretty good and helpful, and I'm sure he'll give you an honest assessment. Maybe he knows someone who you can chat to.
Good luck, and let us know how you get on.
Brian.
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