Pros: Many of these carriers allow baby to face out, which helps keep them from getting antsy as they become more alert. Some brands are also suitable for wearing baby on your back, which is a nice option to have for longer walks or even hikes. I leave my front carrier in the car for an easy option when I'm out and about since all it takes is two snaps to secure.
Cons: If more than one person will be using the carrier, you'll have to readjust all the straps before each use, which can be frustrating once you've found the perfect fit! I've heard some friends complain that these types of carriers hurt their back, but I've found you can usually remedy that by adjusting the different straps, which may take a little practice.
Weight limits: From about 7 pounds up to 30. Some brands require an infant insert for babies under 12 pounds.
Tips and tricks: You can nurse on the go by loosening the straps and lowering baby to breast height. Bonus: some styles have pockets which are perfect for stashing an extra pacifier or even your credit card for a quick store run.