My apologies for the long reply time, I didn't realize you had replied!
Can you explain variables a bit more? I'm not too familiar with that.
The limited graphical customization doesn't bother me about the 780, but I do like the auto wake feature.
re: the 900. What I don't like: build quality, freezes requiring the battery to be removed weekly, buggy and very intermittent rf communication resulting in constant missed or mistimed commands. Remote was returned, I bought another and have the exact problems with the second. Logitech support has been unable or unwilling to help.