Kensington Expert Mouse or CST Trackball?

[Honky]

Hello!
Just joined cause I've been lurking here for over a day (literally) now, and you guys really gave me itchy fingers to open something up and do some modifications, really quite inspiring

Last fall I started experiencing some wrist pain using my MX518 mouse, so I changed to a Logitech Cordless MouseMan® Wheel mouse, and the pain went away. However a few days ago it came back.

So now I'll probably buy myself a trackball (yes, I'm weird), but can't really decide wether I should get a Kensington or CST one, and am thus hoping to get some opinions from you. I have read the CST L-trac thread and the very politely named DPI thread, but I still want more. Half of you here who have tried both seemed to prefer the CST, while the other half prefered the Kensington, but some of this was several years ago, so perhaps opinions have changed?

TL;DR: Opinions on Kensington Expert Mouse and CST 2545-* ?

[Input Nirvana]

I have a Kensington Expert Mouse Pro and really like it.  Mouseworks is very good, and the ergo feel of the unit is equally as good. I've been very interested in the CST L-trac, but have not taken made the jump as of yet, but I'm planning to. It can be a difficult choice. By specs alone the CST L-trac seems the way to go, but using them side by side is the only way to be certain.