We have the angelcare one and love it. There are many out there that will tell you not to do it, and most medical professionals say not to, but I couldn't have lived without it. We have had a few "false alarms" although they all seemed to happen within a 2 week period and in retrospect I wonder if DS was holding his breath/having little breathing issues and the alarm started him breathing again.

My attitude is ok, it may not stop something from happening but it can't hurt to try..