I got my Tour early on day 2 of the original release for Sprint. The trackball was bad but I soldiered on and tried to adapt, get used to it. Finally I couldn't stand it, especially with my old Bold sitting on the shelf next to me, inactive since I ported to Sprint, silently mocking me for putting up with this poor trackball.
I received my replacement(s) today from cnn.cn and did the install tonight. I got an orange one (designed for the Tour), which I installed, and a black one (for the Bold) in case the orange looked hideous or didn't work any better than the original. I love the color orange in general, but in dim light this one looks more like a white trackball that's gotten dirty. In brighter ambient light it looks great. The real great thing is that it has completely fixed my trackball issue. The install took maybe 10 minutes total, a real piece of cake. Very straight forward, no special tricks or techniques. Now my Tour is the way it should have been from the factory!
:-D