I've been impressed with how well the basic feature set works. It answers questions well, if you give it good training data. Their development work is continuing, and I'm looking forward to the announced human hand-off feature going live.

I've tried a few chatbot services, and Chatbase is among the easiest to get up and running. If your needs are not overly complicated (ie: not needing the 'bot to close sales, book appointments, or pretend to be fully human), this is a good match.