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Guys, how smoothly does the trackball spin on these things? I have a Kensington Expert trackball that I like quite a bit, but it's just not accurate enough for text selection if you have the speed set higher (for crossing multiple displays).
If you set the speed fairly high, and then try to select text, is it generally smooth or jumpy and/or sticky?
Very smooth. I keep the DPI on mine all the way up.
About as smooth as an olde-skoole Kensington with the steel roller bearings -- i.e., plenty smooth, IMO better than the modern Delrin or ruby tripod nubs -- and the physical action should get even lighter as you use it a while.
Note you can easily change the hardware DPI on-the-fly at any time; just click the middle+right buttons to cycle thru DPI levels (you can see an LED around the ball edge near the middle button indicating which DPI you're on). If you often need pixel-fine selections, you might use a mid/high hardware DPI and set your OS-level mouse speed comfortably for normal mousing duty, then just middle+right click down to a lower DPI whenever you need finer precision.
Also, to reiterate something I mentioned previously, CST's bundled Superior-X config software appears to be just a licensed/rebranded version of X-Mouse Button Control v1.x, so I've just been using the more full-featured XMBC v2.7 instead. Mac users will prolly be interested in USB Overdrive as a comparable alternative.