I like that they are always looking to improve their product so it is easy for themtour clients too use/learn as well as giving us great feedback! They have helped me get more engagement from my current user base but also given some really helpful advice around how we can better reach out in other markets or target specific groups of people with our products (eg parents).
The fact there isn't anything i dislike about this tool at all - its just brilliant!! We were able tto track where customers came from initially through email campaigns into sales etc which was handy when reporting back internally.