I bought the New Generation Ergo a couple of months ago and wouldn't know a better way to spend the money! It's absolutely fantastic to take my son (almost 7 months) anywhere. I go shopping with him, go for walks, I've taken him to the airport and on a plane in it. It sits very comfortably around your waist, it doesn't hurt your back, and my son falls asleep in it every single time. If he's not asleep, he loves being snuggled into me. His face is very close to mine when he's on my front, so he loves to study it and give me big smiles. There's also a little pocket at the front, where I can easily fit in my housekeys, my mobile phone, a nappy, some travel wipes, a muslin and a packet of tissues - anything I need in case of emergency.
With a little bit of practice, it's easy to put it on without help. I have not yet tried "wearing" my son on my back in it, but I love being really close to him, so I may wait a little while before I transfer him to the other side.
Anyone in doubt as to whether to get the New Generation Ergo: don't hesitate, it's a great buy and will last for a very long time!