Same, though I don't know if tired is the best word for me. For me, its just like, whats the point? Being able to use a computer without having to move my arms more than an inch or so is kind of...relaxing?
[1] http://allthingsergo.com/blog/wp-content/uploads/2011/08/gri...
http://www.reddit.com/r/MechanicalKeyboards/comments/2yfb7e/...
My biggest issue other than that is the behavior of Shift doesn't match other keyboards :\ Can't shift click to select ranges of text.
316 Stainless Steel Precision Ball, 3/4" Diameter
Extreme-Temperature Slippery PTFE Ball, 1/8" Diameter
Hope that helps! I also tried the same stainless steel in 1/8", but that made the trackball loud.