I've never had any problems with my pump and delivery system. Plenty of flow vs head
and always starts up after a power failure. Although, once in awhile I've had to jiggle it to get it started again
I've read where periodic maintenance and keeping the moving parts well lubricated can provide for better life of the system.
Mines been running well for years without any trouble.
Takes a licking and keeps on ticking.
My wife and I love my MagDrive 9.5 !
It's the only pump we use in our tank