I've used a few other user metrics tools before. Heap has had the best self-service aspect. It took a little work going through the education materials to figure out what I needed to do, but once I understood all the tools and metrics available it was pretty fast for me to start creating charts.
The Live Data Feed is great. It allows you to pinpoint the exact user interaction you are trying to measure without having to work with engineers to add segment events.
Heap has allowed me to gather quick insights when I needed to make fast prioritization decisions and I have set up longer-term monitors on things I want to keep an eye on. Review collected by and hosted on G2.com.
Heap auto generates great visualizations for each metric and you can choose the type of chart based on your data (bar, donut, line, table). I do wish I could customize visualizations with my own colors or add notes to data points when I want to create a chart for a presentation. Now, I have to take a screenshot and add the notes outside of Heap. Review collected by and hosted on G2.com.