http://www.choice.com.au/viewarticleasonepage.aspx?id=103548&catId=100531&tid=100008&p=1
Choice has tested a few and rated them on this page. I have a Baby Bjorn Active (not tested but fabulous, with even more back and shoulder support than the Original Bjorn) and a Natures Sway Sling.
Choice rates the Original Baby Bjorn the best and the Natures Sway and the Babasling the worst.
I agree with alot of what they say about the Natures Sway but I found the sling was great with baby 1 who cried alot. He hated the pram and the upright carrier and this was one way to get him too sleep. I agree that it was an uneven weight and sometimes uncomfortable on your shoulder when bubs got heavier but when you've got a crier you'll do anything right?. Also there is an age where it is hard to lay them down or sit them up 4-6 months where they want to look butdont have the head control.
I would recommend the Baby Bjorn Active available at Babies Galore at the moment for $189.95 but they have 10% off from Saturday.
Hayley, NSW, Liam 07/02, Beth 09/04, Nate 03/06