SIDS prevention.

Alright mamas scary thought but we all know SIDS is a real risk! I'm looking at all of these crazy gadgets that are supposed to help you sleep better and with more piece of mind that you will know it if your baby stops breathing. Have any of you had any experience with these heaven sent gizmos? I've seen ones that clip to the diaper, ones that clip to their clothes ones that wrap around their foot. What would you guys recomend? I'm also wanting something I can use in the car and I've seen that the motion sensored ones can't be used in the car. So I'm looking for opinions! What's the best one you've seen so far?!