J.K.
I have a bumper pad... but I also bought the Angel Care monitor system which monitors my sons breathing.. if for any reason it doesn't sense his breathing.. an alarm will go off.
It is awesome. When it has gone off, it has always been because he was too far away from the sensors.. at the foot of the bed.. or a few times because his face was on the bumper pad. He is 9 months old.
It is a little pricey but worth the price for my peace of mind.
J.