I have an Ergo and I

it. My husband wears it too. We bought the infant insert and used it from pretty early on although C was too small for the first 6 weeks or so and I kind of wish we'd got a Moby for that.
We've flown a few times (international) with C already and the Ergo has been perfect. Super comfy and easy to use without any help. I've had to take C out on the flights we've been on (and strap him to me with the infant belt) but I haven't found it too hard getting him back into it again when I need to - even when sitting in a window seat on a Tiger Airways plane
I have friends with the Baby Bjorn and the main problem they seem to have is bubs getting too big to carry comfortably for any length of time - at 8 months!