I've had my ThinkPad T430 for just over a year and a half now, and I'm to the point that I can't use another laptop without reaching for this danged button a few times an hour. I'm not absolutely sure why I find it so useful -- I think I mainly use it when I'm honestly "laptopping", that is, when it's in my lap. It takes a lot less real estate to use it than the trackpad. But I suppose it's also more efficiently for small mouse adjustments, or, I've noticed, particularly when my "trackpad hand" (right) is "returning" and I want to move the cursor to the right. Strange the habits I pick up.

In any event, I didn't think I'd use it at all when I bought the laptop, and hoped it wouldn't be a nuisance. Now, I guess I'm addicted.

Image via wikipedia: http://en.wikipedia.org/wiki/Pointing_stick#mediaviewer/File:Mouse_pointing_stick.jpeg