[cholly]

I bought one of the Monoprice 3 input switchers to use with my Toshiba HD-A2 HD DVD player and my TiVo Series 3 HD DVR. I used three 6 foot HDMI cables for hookup to the single HDMI input on my Sony KDF55-A20 RP LCD HDTV. The TiVo worked faultlessly, but sadly, the HD DVD player would lose the HDMI handshake after just a few minutes. I RMA'd the switcher back to Monoprice. In retrospect, it probably would have worked fine with the current level of firmware and premium 3 foot cables from Monoprice.
Because of the problems I had, the HD DVR is connected to one of the component inputs of the TV and the HD DVD player is connected to the HDMI input.