Actually, I love the MX-500 and am using it with absolutely no problems in my HT setup with the 1050, cable box, Toshiba DVD & TV, and Panasonic VCR.
Since I have had the 1050 remote lying around and set up a second audio only system in the LR I thought I would use that remote to replace the two NAD remotes for the C370 amp and T571DVD player. I've been able to get the amp and tuner to respond to the 1050 remote but not the T571 . . . Thanks for your reply. As soon as I hear something from NAD, if I do, I'll post it here.