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This is part of my setup
First, I use my keyboard a lot, rarely touch any pointing devices, just to select text or make a screenshot. Okay, I make quite a few screenshots sometimes. :)
This trackball is definitely more comfortable then Apple Trackpad and much better than Apple Magic Mouse.
Second, I had never used trackball before I bought this one, so it's hard to compare with other trackballs.
Yes, I use it assembled.