I am thinking of buying a movement monitor.
No info on the Snuza but I have have love the Angel Care monitor also.
I didn't even know about the Snuza until now, which I plan on checking out!! I would love to have a monitor that will work for her down stairs on her bouncy and pack n play. We do LOVE our angel care monitor though. As for tummy sleeping, Addie wants to sleep on her tummy too, however she will put her face down on her crib and then can't figure out how to get her face moved... go figure since she is so strong and can lift her head amazingly. Do AC ever do that or is she good about moving her head from side to side and not face planting into her crib/bed? I wish I could let Addie tummy sleep, she sleeps so much better on her tummy.
I ended up ordering the Snuza and it is coming this week so I will let you know how I like it.