I like that it's easy to use, gives me real data about my shipments and helps keep track of them throughout the process! It also seems fairly reliable when compared to other services out there.
Nothing really - but they do have some good customer service people who are very quick at resolving issues, so if you need help just ask away. If your looking for an eCommerce shipping solution this will be perfect for you! Easy way to see where everything stands during checkout (where things stand can vary depending on how much stock we're holding).