I have a Jazzsling and another sling and I can't praise them enough! Although it was too hot to wear my baby when he was born, i use it with him now and he absolutely loves being close to his mummy and being able to see the world from up high as we walk around, i love it too, it doesn't even feel like i am carrying a 12kg child. I have a dodgy back too and it is never sore after i carry him, even if its for a couple of hours.
My aunty is the manager of a baby store and she NEVER recommends the baby bjorn and the like to any customers because she too knows they are not good for baby's spine. She always recommends a sling and thats how I found out about my slings (i purchased mine from ebay).
I LOVE my slings and I will definately be using them for my next baby.

