From: Jeff Shultz 

On Wed, 02 Feb 2005 15:30:28 +1200, Don Hills wrote:

> In article , "Gary Wiltshire"
>  wrote:
>>This "marble" is at least an inch in diameter.  Quite
comfortable under
>>the thumb.
>
> I've tried both the Microsoft (finger) and Logitech (thumb) trackballs and
> settled on the Logitech. I especially like its optical sensors - no
> rollers to gunk up. And although I'm left handed, I've trained myself to
> "track" right handed because no-one seems to make a left
handed trackball.
>
My Logitech still gunks up - there are still little bearings in their to
keep the ball rolling around.

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