I use a MX1000 still, and it's the exact same as that, with less DPI. Having the extra 3 buttons on the side are crutial, tilting the mouse wheel side to side for more functions, and a mouse button abobe and below the wheel makes for great spells/skill you don't use often (or are timed).
Having something like that makes it great to do something right after a hotkey without having to worry about another hotkey for combos, or a run of commands (Use your imagination).
As for the MX1100, as I said; it seems like a MX1000 upgrade. My MX1000 is still working great since 3 years ago, except the battery is only lasting about 4 days of intense gaming (Use to hold for about 12).
