I actually tried Kera for our product (https://codeable.io) and even had a Skype conversation with one of the founders, but I knew having a walkthrough guide (their product) was just a band-aid for poor UX, and as such, just a temporary solution, not really worth paying for in the long term, especially when it was easy to use one of the open source solutions and adapt them (like Zurb Joyride) to our needs.
Nevertheless I wish the Kera team good luck on their next venture!
Nevertheless I wish the Kera team good luck on their next venture!