It's a cheapish pump similar to this https://www.mmcwebshop.com/products/b5b179a61e4/353720000001....

Not too concerned about durability yet (way too happy with the fact of having water!), but time will tell. The previous pump we used was the same and it handled about a decade or two of abuse and sandy wells (though not in a short lived fashion as you say).

The buffer tank is a good solution but we were actually advised by professionals to go with this slightly more compact and cheaper option. I suspect you are right though.