The Software Development Kit is the most versatile one I've used in a long time and it's very interactive and easy to implement. The Real-time information exchange is also top-notch and user friendly Review collected by and hosted on G2.com.

A real-time help option would be highly acknowledged as there are so many features to be used and it get really tough to understand if you are doing the right thing or in the wrong path. Review collected by and hosted on G2.com.