We recently switched to the Walker version of the weighted sleep sack for my son, and it's been a great transition. He had been using a weighted sleep sack for over a year, so I was a little nervous about making the change, but he adapted right away. The walker design gives him more freedom to move around independently, which he loves, while still providing the comfort and coziness he's used to. He stays comfortable throughout the night, and the added mobility has been a huge plus. We're very happy with it!