When I saw these I was so excited but unfortunately they didn't match up to expectations. To get a good seal you really have to scrunch every bit out of air out of the pumps and then unfortunately the vibration isn't overly strong. We decided not to give up on them though and use them as part of play with other things. That worked out a bit better the gentle vibration added to the other sensations going on. So not a waste but definitely not a main player.