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Do you have a TiVo or DVR of some kind??

I have a Direc TV PVR.
The button layout is great, compared to the 880 the buttons are large and easy to find, what I really enjoy is all the commands for my devices are shown on the larger touch screen, makes things much easier to find during night viewing.

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Can the volume control on the remote be defaulted to always control receiver volume regardless of what source (listen to music, watch dvd, etc ) is chosen?

Yes, I believe most the Logitech Harmonys can do this.
Another thing I didn't mention is the remote comes with a new setup disc and the whole setup is easier and better looking.

A computer once beat me at chess, but it was no match for me at kick boxing.