I like having everything in one place to track orders or customers without needing separate tools for each function! it's very easy for new users as well because there aren't many options when you first open up an account with them (especially if they're not familiar w/o using their product before).
It takes some time getting used to but once your comfortable then its super simple!! If you are looking into this software than make sure u have someone who knows all about wordpress help ur set things right from day 1 of setting something up so no problems afterwords. Customer service has been great too - always willing & able to answer any questions i might've had throughout my experience working through cart 66!