I currently have a 12lber in a fabric sling (Close parent) and cannot see this being a long term option so am thinking of buying a structured carrier, maybe the Bjorn Synergy or the new Miracle. The fabric sling is okay at home but keeping baby's face from being squished and shoulder / back pain for me means readjustments and short durations are required.
Also, I know some people are anti-BB but is there any evidence or is it more of a gut feeling / urban myth? BB's website says they are recommended by experts.