We have been using this almost 5 months now. I have several carriers including and i.n.fantio and a m.o.by wrap, and This is my go to! I'm 5'9" and am NOT tiny. I'm a 10/12 and have no problems at all with this carrier.
I would rate this at a 4.5 for now. I have only used it a couple of times, but am happy with the purchase, and would possibly give it a 5 after more time. I have no concern that my baby will be secure in this one. I have not tried the pouchless variety, but can see how they might be slightly easier to use, since you would not have to guide the baby's legs through holes. [...] The cloth is perfectly placed, so the carrier is still clean. Great idea! Thus part of the early 5 star for quality.
This one is good for newborn too. Others as late as 3 months.
I figure any carrier where you wear your baby in front of you will pull on your back at least a little. The material is great quality. It does get a little more difficult to get baby in and out as they get bigger, but not too bad. My only concern is when I lean forward in it I feel like my baby is unstable, & I have to support baby.