Series 0 Space Gray, ordered the first day they were available, worn every day since, never had a case or screen protector, screen is pristine, case looks great unless you get out a jewelers loupe, then you might see a few small nicks. The lettering on the back is a bit worn, but I don't look at that side. It's slow, because it's Series 0, but otherwise still going strong.
When I see people say, "if I hadn't had a case on it, it would have broken" - they can't know that, they're guessing and/or justifying their case purchase to themselves. Yes, perhaps it would have broken. But mine has knocked into a lot of things in the last 4 years... you wouldn't know it from looking at it. Apple builds them to be pretty sturdy.