I like that there are many features to utilize, from shipping labels, tracking number creation, etc. There is also an API available if you need your own customizations built in as well. It's difficult to find out where certain things can be found within all of the different areas/sections of the platform.
If you're looking for a great cart management system with tons of options, this might not be the right fit for you. We have used x as our main cart software because it was easy enough to train