[brianprovost]

My Intellimice last for a few years but eventually either the rubber coating on the scroll wheel detaches or the left button starts occasionally double clicking instead of single clicking.

I'll try out the Sensei, thanks.

[larrik]

Both my Sensei's developed issues with the scroll wheel.

Otherwise they're really nice.

[ahartmetz]

IIRC mine once had some issue with the scroll wheel that I fixed by removing a dust ball and / or applying silicone grease. Silicone grease is great for lubricating anything plastic.