I could not walk for longer than 30 minutes without having to stop attempt to readjust and carry on. I ended up having severe back pains with this carrier and in the end sold it online.
Yes you can breastfeed in this carrier, yes you can allow baby to face forward (which I am fully aware isn't the best position for baby due to current research), and yes it is relatively easy to use.
However what matters is the bottom line and it is ..... I would not recommend this carrier to a friend.