Rory loves it! She attends daily while we are at work. That being said there are actually several doggie daycare options near where we live, and I would not just drop her off at any of them. The one where she goes is the only one in city to have real grass. She is a favorite which doesn't hurt things either.
She really hasn't picked up any bad habits - if anything they taught her it was "okay" to potty outside. Before she began daycare she would only go on her pad. We would go for a long walk without her using the bathroom once and then the second we were back home she'd run to her pad and squat. Poor little thing.
I also love knowing that she is having fun (can also watch on the webcams) while I'm at work.