Well, my 14 month old son and I love this carrier!! We were happy with a hug-a-bub until a couple of months ago when he got too heavy to be carried for long periods on my front.
Once I got used to putting him on my back it is now easy to do. James loves looking over my shoulder at what's going on!! I've managed to also transfer him from my back to my front for a snooze, as he finds it more comfortable.
It is like carrying a day pack and really doesn't feel that heavy. I'm happy to prove all those people wrong who doubted I could live without a push chair!!