We've been using the Zen Swaddle for about a month and my daughter will now go back to sleeping on her own after a feeding. She's also started sleeping in longer chunks (up to 8 hours!). I know some of that is due to her age as well, but the Zen Swaddle really helps in that she doesn't startle awake when I try to put her down or take my hands off of her. She consistently sleeps better when she is wearing it and falls asleep quickly (usually within 5-10 minutes of putting it on).
This would probably be my favorite swaddling product just because of the quality of the materials, but the weighted pouches really put it in a class all of its own...Thanks to Nested Bean for thinking up this amazing product!