Would you try a sleep sack if baby sleeps great?

My little girl has been sleeping from 8:30 pm to 5 am every night consistently from about 6 weeks old. She stirs a little every couple hours but never wakes up fully and always gets herself back to sleep. She sleeps in just pajamas but I was looking at some sleep sacks like the nested bean one and wonder if that would be even more comfy for her sleeping and help her stay warm when the fall and winter get here. I’m especially tempted because we just switched her bottles from the Mam bottles that worked great to the Comotomo bottles that work equally great and her spit up has pretty much decreased to nothing and we had no idea that we could improve in that area. So my question is 1) would you try this if your baby was already sleeping well? 2) anyone have any experience with the nested bean sleep sack?