There's quite a few women in my stillbirth support group that swear by the Oricom Babysense breathing monitors.
I love the Snuza and we haven't had a false alarm so far. It's gone off twice but both times when DH or I were holding him and shifting him around so had knocked it off his tummy. The little flashing light actually blinks to the rhythm of his breathing. We also have a co-sleeper/sidecar cot which I'm in love with!