NO WAY.
When it comes to model M's, I think of them as something old which is better than the average today. However, ball mice is something that got thrown out quite a while ago, for a very good reason.
NO to ball mice!!!!!
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(not the only reason, a ball mouse never really feels spot-on)
EDIT: Did you mean a trackball?
Uh... that's what mouse pads are for, none of my ball mice get clogged up with dust in the rollers: you have to treat ball mice with respect, and they'll respect you back.
I've cleaned out many mouse rollers: I've become quite proficient at it. People get mad and slam the things when they can easily be cleaned with some gentleness. And that looks like an HP-branded logitech mouse. I hate those things.
I will say that for the most part, I think it's very good that ball mice have gone away.
Like every type of hardware, there have been good examples and bad. The difference between a bad ball mouse and a bad optical mouse? The bad optical mouse is still usable with a minimum level of frustration.
Good ball mice were good...I've got a couple examples of ones which I would agree are quite accurate if you know how to use them (yes, there are right and wrong ways to use a ball mouse, unlike optical mice).
Ball mice are very good if you use them appropriately and have a decent one. I really like the new IBM ones because they just feel so crisp (they're like any standard red-wheeled IBM mouse, but with a ball and sometimes lack a scroll device depending on the model).
The microsoft ones feel "gummy" to me, and kind of slimy. Very weird plastic.