I like cadence for hill-climbing. It helps me focus on spinning rather than mashing, and I really miss it if my sensor moves and I lose my cadence reading.

I also use it for Spinervals DVDs on the trainer to ensure that I'm correctly doing the workout.

I have this wireless (both speed and cadence) computer: http://www.performancebike.com/shop/...slisearch=true Yes, it's quite pricey, but I've been so happy with it.