I've had my Tour for about 8 weeks now. It did come in a box with the famous 'green dot' on it.
This week, I've started noticing trackball issues; not with the left/right direction as has been mostly reported, but with down only; up works ok.
It's not nearly as bad as the video's I've seen with defective left/right movement.
With a sensitivity setting of 70 on both directions; status test shows mostly down 1 with a few down 2s. I get similar results (maybe a few more 2's) with the left/right directions and even with up (up gives more 2s than down, but less than left/right generally).
Test test results are not so bad, but the basic usage of the device in messages and web pages has definately changed. The delay or slow/skippy scrolling down is noticeable.