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This one is way better.
Even though the bearings are POM instead of ball bearings. they are clearly superior to the "not-a-bearing" logitech uses.
The ball on the CST is also nicer quality. I like the larger ball trackballs as well and can't imagine using one that's less than 2" in diameter. You can swap it out with a standard poll ball if you like, they are the same size (2.125")
Actually, since it's phenolic resin, you can probably use it as a pool ball if you need a spare :p