Yeah ... the blue tanks like the one in your back yard seem to last longer but the plug up with rust where it does a 90 deg if you have a lot of elemental iron in your well water. They seem to clean out pretty good with muriatic acid but you have to be careful.

Found a nice Amtrol WX -250 on the dump years ago. Carefully cleaned it up and put it back into service. Having such a large tank really cut down on the pump cycles and saved on the electric bill. It's nice when the power goes out too. You have more of a draw down before the tank runs dry.