I replaced an 2001 or 2002 Intellimouse with a Sensei a few years ago. Then it broke and I got a warranty replacement (upgraded to the full model). Then THAT broke and I replaced it with a Logitech (which is fine, although I spilled coffee all over it).
Meanwhile, the Intellimouse is still 100% functional in my laptop bag.
Meanwhile, the Intellimouse is still 100% functional in my laptop bag.