A fundamental decision is: do you want a traditional "wand" type of remote with hard buttons (that may never be in the right place) or a "screen" type where you can layout the buttons any way you like? There is also a sort of middle ground where a few hard buttons surround a somewhat programmable screen.

Do you want to use a phone or pad as your hardware?

Do you want the configuration process to be similar to what you are used to with the MX-700's or are you comfortable being up to your armpits in computer code?