I've used the same large thumb operated trackball for many years and it's never broken. It only needs a ten seconds cleaning every so often. I like it because there's no wrist motion.
I've been a Linux user for over a decade and I'm no fan of Microsoft, but this Microsoft branded trackball is certainly my favorite. I don't like the trackballs that are finger operated because pulling my fingers back means my wrist comes up. My wrist gets sore from any repetitive motion.
BTW with trackballs cordless isn't needed since they don't move. On a desktop anyway, the only thing different about cordless for a trackball is the need for batteries.
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