I like that you can create different campaigns with multiple goals, it's easy to set up, has great reporting options (including custom tables), integrates well into other platforms such as Facebook or Mailchimp etc., good customer service when needed - they are very responsive! It doesn't have any inbuilt features but if your looking at building something similar then this would be my go too option without question given their pricing model which includes all future updates/features free of charge unless we upgrade our plan afterwards.- Automation across many accounts / clients using one tool;.