The Logitech MX Master series has a heavy, (optionally) free-spinning scroll wheel.
It's the best scroll wheel I've ever used: night and day better than anything else. Scrolling through a long doc is a flick or two, and it just keeps rolling along, until you touch it and it stops instantly. It allows amazing precision.
There is a mechanism controlling the wheel mode that can mechanically get into a position where the magnetic control doesn't do anything.
Sometimes, thumping the mouse hard against your thigh helps resetting the mechanism, but sometimes not. My first one went out within warranty, I've got it replaced, but I'm sure this one will fail in a few months, as well.
Logitech probably saved a cent or two there, crippling an otherwise fantastic mouse.
My original MX revolution is around 15 years old and the scroll wheel still works fine. I did have to solder in some new microswitches for the main buttons, but that's not unexpected for the amount of use its had.
It's the best scroll wheel I've ever used: night and day better than anything else. Scrolling through a long doc is a flick or two, and it just keeps rolling along, until you touch it and it stops instantly. It allows amazing precision.
If only the side-to-side scroller was as good ...
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