I tried unswaddling LO last weekend. We put her in the sleep sack. I tried it for 2 nights and both nights she woke up several times. She usually STTN. So we're back to swaddling but I'm not how long she will fit in the Miracle Blanket. We started with the Swaddle Me but she grew out of that about a month ago so we switched to the Miracle Blanket, which is aptly named as LO now sleeps about 7-8 hours a night. But it's such a pain to get on. I've given up trying to get her in the blanket while she's awake.
It looks like all of the swaddle blankets are made for little babies. I guess the assumption is that you only swaddle for a few months?
What do you use to swaddle your LO? DH and I both tried swaddling with a receiving blanket using the method we learned at our childcare class but neither one of us can get it tight enough to stay on her for longer than a few minutes.