groundFungus:
If a quality load cell and used within their specifications (mounting, excitation voltage and load, especially) I would expect them to last for years. I, in my job, had load cells that had over 20 years of use.
Great to know! I bough them from trusted local store so I believe they should be of pretty good quality.
Maybe you have more information on using 2 of them on a single base and best way to mount them?