I have the little Cat-Eye, not sure the model I'd have to check, I've been using it for more then 10 years with no problems. It has a few scratches from accidents, over the handlebars twice, but it keeps working. Battery life is amazing. I see they have another model that has cadence for less then $30.

Sorry, it's the FILZER DZ‑4LC3 WIRED CYCLING COMPUTER that has cadence for $27.