I had the front pack one similare to the baby bjorn one when I had Sophie and found it hard to use and pretty much only used it a couple of times.
I got the bubba moa sling when preg with Gracie and LOVE it. I used it almost at every outing till she was about 9 months. I had to stop using it cause I was preg but I could have used it for alot longer as a side support when carrying her etc.
Both Gracie and Chloe loved being all snuggled up in them. If at home on a really unsettled day I would use it also.
I sometimes worried with gracie it would make her to attatched to me but it didnt and she still self settled at home and would settle in the pram sometimes but I loved having her on me so to speak.
I am guessing I will use the sliong for alot longer this time as I wont have belly in the way.
Oh and mine is soooo easy. Can put her in almost one handed.
And use it alllll the time. Love love love it. Only wish I had it for Soph - oh well.
Oh and didnt cost much - like $50 something.