I have a bonavita. It looks terrible due to something with the finish, but it's been used daily for 4 years and counting. It's also been dropped and spilled on quite a bit. It's not heavily built at all, but it's a kettle, so it isn't like it needs it.

As for the finish, it's either porous and terrible or breaking down somehow. I went through a depressive episode a couple months into owning it, let it get some dust, and the thing has looked dull and dirty ever since. And it's only just starting to develop scale, which given how hard the water is here, I'm very pleased with.