Does anyone have experience using a crib wedge to keep baby from laying flat? I have one on my registry currently, but wondering if it'll be worth using. It seems like a good idea for reflux issues that may arise, and also if baby doesn't like to sleep flat on his back, and it's not expensive, so I'm leaning towards purchasing it if I don't get it at my shower.
Thoughts? 
This is what I'm looking at: 
Re: Crib Wedge - anyone used one before?