The customer support is excellent and very fast to respond. They are always updating their product and adding new features. Sometimes it takes longer if you need something more specific than the default feature, but they are quick to help you out! I have not actually used the API yet, but it seems like the documentation is really good. I am currently using their Chatbot API for my chatbot application. It has been working great so far, and it has enabled me to implement a lot of features I had never thought would be possible without any customization from my end.