Kensington Expert Mouse replacement? Or other recs

Hi-

I've used Kensington Expert Mouse trackballs for years and loved them. I'm on my second, which has lasted about 5 yrs I think, but the rubber is starting to flake off the scroll wheel at a rather alarming rate & it's becoming hard to turn it.

The only thing I've missed is a true middle mouse button (I can "chord" to get the effect, but it's not the same).

I've been offered as a belated XMas gift a chance to replace it and before I go with another EMT I thought I'd ask here what you guys use & recommend.

I'm leaning towards another trackball because I have limited desk surface space & it's so darn comfortable (no wrist fatigue, ever).

Suggestions?

TIA!

-Susan

Hi xiwix-

Yes, I agree it's probably a good idea to stick with the tried & true. I am considering the Kensington Slimblade Trackball though, since it does away with the scroll wheel altogether (the ball *is* the wheel).

Thanks-

-Susan