I've had one in my office for several weeks now and haven't gotten tired of it yet. It does seem to be close to the Platonic ideal of "fiddly desk things while my code compiles" where the appeal might not wear off.
I had one on infini-loan from a non-fidgety coworker, but then I changed desks. I didn't want to outright steal their spinner so I've gone back to playing with pens. Haven't yet felt the need to go buy a spinner, pens fill that niche for me nicely.