How good are Hydromatic sump pumps?

I just replaced a Hydromatic D-A1 with date 4-98. It was in service most likely from 1998 till I replaced it here in May 2021. 23 years on duty. I’ve owned the house since 2007 and it was there. It looked old as hell the day we moved in. Its watch has ended.

However, the pump is still working fine; that’s for sure. It’s just the switch failed “on” recently. I discovered it sucking air and intermittent water one day, running constantly in a nearly dry pit. I don’t know how long it was like that, but I assume less than a day. But it could have been a couple. It’s pretty quiet.

Thinking of servicing the switch and keeping the pump on hand as a last resort backup I can install in the middle of the night if for some crazy reason the battery backup fails or isn’t cutting it.

I hate to throw away such an impressive unit!