We crate trained Abby but she never went in her crate overnight. I am an extremely light sleeper so we keep her collar on and the moment she moved, if she didn't lay back down, we took her out. She is crated while we are at work and about 2 months ago (she's 13 months now), we tried un-crate training her little by little and it failed miserably. It took another 3 weeks to get her crate trained again, despite the pet sitter who comes midday for about an hour every day we work. We will give it a shot again in a couple months...seeing that Roxy did well at 18 months, maybe we will have the same luck.
Brady on the other hand, is never crated anymore. He has a crate and it's in his play area while we are at work, but he doesn't need to stay in it. what a good boy he is!