It's easy to use, it has nice features (interactive charts, geolocation, etc.). You can also drag&drop info sources directly in your map. The UI could be improved - sometimes you need more than one click for something simple like adding new point or changing labels position. I'm using this as an interface between our internal database system and our clients' CRM/ERP software.
The most amazing part of kumu was its ability to visualize my data in an easy way, it allowed me to create manyโฆ