I've had a couple of the Marathon first gen for 3-4 years and I've been very happy with them. Partly because they are $<30, but they also have very long life (

I've had a couple of the Marathon first gen for 3-4 years and I've been very happy with them. Partly because they are $<30, but they also have very long life (I've only changed batteries once), love the switchable scroll wheel. I was looking at all of the fancy ones and came very close to buying one, but after getting the Marathon I declared it my official mouse.