Quote Originally Posted by bcr229 View Post
I have older ones and run them through the dishwasher on the sterilize cycle so they get a LOT hotter than the enclosure. None have ever warped.

It sounds like the new ones may be less desirable.
That's interesting. I do the same thing, and oddly enough both the new and old style get a bit of the bow to them. Nothing crazy by any means, but there are a few of both styles that don't sit quite level anymore.