Nested bean, zen sleep sack??

Has anyone used these? They are “weighted” sleep sacks. This one has zip off arms for babies who want theirs arms out, like mine! My Baby is 4 weeks old. Currently use halo but hate the Velcro! It wakes her up every time. I’m a little nervous about the weight to this? But baby loves to be held and in our arms so I was thinking this would help her sleep. Thoughts?? Anyone use these or heard good/bad reviews?