For many weeks it was the puff in between me and the co sleeper that she wasn't using, the ball on the other side of me and then dh practically falling off his side of the bed since I was leaving such a big space between me and the puff LOL. The snuza is the only reason I get any sleep!! It's gone off a couple of times because it got loose from the diaper, but one night the 15 sec vibration woke me up just as I saw her pick her head up from being stuffed in my arm pit! So scary.
Anyhow I'm glad you like it. It's the best baby item I've ever owned! And I'm pleased to say that we've got the ball finally staying in his bed at night and the puff decided she's ok with the co sleeper