I have a BabyBjorn Miracle. Love it so much. We go everywhere with it with my daughther

. Can't imagine going out without one! It is so convenient and easy to use. Can put the baby in the carrier without help. (Need to practice a few times first). Baby insert is not required too. Can be used facing front or towards you. It is also convenient for transiting too compared to a push chair .
Can be used from birth, max weight 13kg. Bought it when my daugther was 3 months old. Had a different carrier before and within a week, I lost the waist strap, and it was not easy to adjust the length of the strap when me and my hubby swap over, we have to help each other (With the BabyBjorn Miracle, it is so easy, you can adjust it yourself).
I also have a home made sling. Agree that it only distributes weight on one side. I do use it at home just before nap times mainly.
Hope this helps.