No more rusty metal pipes under my house. It’s plastic all the way from now on. Well, mostly all the way - there are a few metal pipes left in the walls where they’re inconvenient, but also unlikely to cause any troubles. I had a nice cup of tea with the plumber when he’d finished the job, and he regaled me with tales of the bizarre and monstrous decisions made by whoever had had the temerity to previously plumb my house. Before there were rust-laden pipes going round in a big loop for no useful purpose. Now there is a efficient and modern plastic pipe to transport clean artesian water directly to my kitchen and bathroom, with considerably stronger water pressure.
I mostly like that the water doesn’t taste of rust any more. It tastes a little of dirt, but that’s a temporary condition you get after plumbing.