Alfred_B,
I've never had a Zoeller M53 last less than 12 years, but12 years is starting to push the envelope on failure risk, especially if it runs quite a bit. If you install a backup, then you have some redundancy if the main pump fails.
I upgraded our sump pump last year and spent LOTS of time evaluating systems. This following site is a good place to learn about what is available:
https://www.sumppumpsdirect.com/?gclid=EAIaIQobChMIv7SljN774QIVS__jBx2WjQjrEAAYASAAEgJe__D_BwE You can find killer Zoeller deals on the internet if you are patient.
Water powered, battery powered, inverter systems - each has pros and cons and prices can escalate into the thousand$. Every installation is unique and depends on your risk level and budget. The most expensive systems have more fail safe redundancy, I.E., 2 main pumps and backup pump with a sophisticated control system. I have an unfinished utility basement and low risk, so I went with the lower end setup.
IMO the 2 most established mid-level brands are Zoeller and Liberty, both U.S. made. There are excellent China made brands too (Little Giant).
Water powered - my biggest con was that Michigan requires it to be installed with a RPZ valve (not just a check valve), which adds a good amount to the cost. They are not fool proof either.
I upgraded from the M53 (worked excellent for many years) to the premium M63 (on sale nearly same as M53). I plumbed in the Zoeller Aquanot 508 backup kit.
This pump is extremely well made (U.S.) and robust. The charger is substantial also. Many of the other battery backup systems in this price range and lower have inferior pumps/chargers. The Basement Watchdog systems did not impress me. Better systems than Zoeller are available at much higher prices as shown in my link above.
Yea, I chose and endorse the Zoeller system after a LOT of OCD evaluation. Let me know if you want more detailed info and specifications.