OK - I have to publicly announce that I am a carrier-aholic

I have a HAB which I have used from birth and continue to use. Pro - lovely and snuggly, good head and body support, easy to put on with some practice, very supportive for my back with good weight distribution. Con - it takes a few minutes to put on (but you can put it on before you leave home).

I was given a Baby Bjorn (old style without the back support) which I use too. Pro - quick to put on, easy to get off, can face the baby toward you or outward facing. Con - hurts my back and the weight of the baby is taken on my shouders (but this may be because it is the older style)

I have just bought the ERGO too which I LOVE!!!! Pro - easy to put on, quick to get off, great support for my lower back and the weight is taken on the hips so they don't feel heavy, can carry the baby on my front, back or hip. Con - they can't be faced out if they want to sticky beak.

I would have bought a sling too but thought that was getting a little excessive. HTH