Baby carriers

I had a fairly expensive one that everyone raved about, I couldn't use it for more than a few months because I just found it too heavy and uncomfortable, I used it once when my son was 4 months old and I was nearly crippled by the time I got home, my back and shoulders seized up for days afterwards.
So in my opinion you want one with excellent shoulder and back support, and nice padded shoulder straps and one that fits securely to your body (mine always felt a bit wobbly lol, kind of taking away the hands free advantage).