Anyone use one? Love it? Hate it? Which tog do you have?

LO is 13 weeks and has been swaddled with an A&A swaddle blanket for almost all bedtimes. I'd like to eventually switch to a sleep sack but she still flails a lot if I put her down unswaddled. The ergo cocoon looks good because I can put both arms in, one arm out, or both out.

Thanks!!