I have a fairly large X10 installation that I just added around 40 or so Insteon switches/dimmers to based on the inputs of a couple of people in this forum a few months ago. I also moved things around into a new wiring closet, etc., etc.
Well, my X10 signal went down the tubes, even though I have an XTB- IIR. I thought, maybe another amp of some flavor would help and I contacted Jeff Volp.
He helped me (via several emails) isolate my problem(s) and I'm happy to say that you can have a reliable, large X10 (60 or so devices) plus Insteon (over 40) installation!
You just need an XTB-IIR and the expert help of a very committed guy like Jeff!
By the way, the issue had nothing to do with the XTB-IIR -- it's a GREAT product! There is no way this installation would work with my old Leviton coupler/repeater.