I love this product. Have used it since my eldest was born 2.5yrs ago & am still using it for my youngest. It brings peace of mind. I don't worry about mat little one at all as I know the alarm will go off if something were to go wrong. Don't think I would be able to sleep well at night if I didn't have one.
The only negative thing is that it is sensitive & won't work with the fan on hight than medium or if a musical mobile is on. The sensor picks up the fans movement & vibration from the mobile. Just check it regularly.