He LOVES it and has slept in it every night since. Some nights he still needs his BOB time in our bed with us, but then as soon as Bob is over he goes into his bed. This is great, because we'd gotten into the terrible habit that he fell asleep with us in our bed, then at some point, one of us would get annoyed enough with him kicking us that we'd transfer him to his crib.
The morning after his first night in the new big boy bed. Didn't fall out, and stayed at the right end, or at least that's how he was when I found him.