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Title: A little small and missing a button.
Review: I finally dumped my Microsoft D67 due bad ball movement and constant need for cleaning. I bought this one as a replacement due to similar ergonomics. What a relief to use a silky smooth ball instead of that moon rock from Microsoft. I would rate it five stars if it were a little larger and had a button for fwd and one for back. As it is, the scroll wheel can be set to activate the "back" command, but I would like an instant "forward" command like the MS had. That would cause me to give it all five stars. It is trouble-free, never needing ball socket cleaning like the MS.
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