I like how easy it was for our team of 20+ salespeople to use this system! It's not just another reporting tool but also an extremely useful platform from which we can do so much more - including data entry (using Zapier), reports generation as well as tracking customer service issues & interactions with them via emails/social media channels etc., all within one place.
The only thing i could think about would be some customization options regarding design elements or page layouts in order to make things look better than what they are right now. There isn't anything really bad though at current state. Do go ahead!! We have been able to track everything related to billing easily using AmiStrat strategies.