I've used the cheaper version, Summer Infant's Swaddle Pod... it's sold next to their popular swaddleme blankets. I loved it, just like zipping the baby up in a peapod. it kept my newborn's arms in and it stretched nicely, but with all swaddling products, every baby's different. the swaddlepod only comes in a newborn size, so probably after 10-12 pounds it won't work, but it's really for the early, just-out-of-the-womb days anyways.. Nice that you can check it out in-store first (babiesrus, buybuybaby, etc) as opposed to woombie.
http://www.toysrus.com/product/index.jsp?productId=11193072
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