. . . membership updated.

Looks like Carl covered most of your questions. I will add one note: VS pumps are essentially un-repairable when the electronics fail. The cost of replacing that module typically runs around 70% of the cost of a new pump. That's not a huge problem in areas with stable power, say Arizona. But, in areas with summer thunderstorms, it can be a major issue, since the pump electronics do not handle voltage surges well, much less nearby lightning strikes..

It is possible to install full blown protection ($400+) that will probably preserve the pump unless lightning strikes YOUR house or power-line. But that's a significant additional cost . . . and complication.