It's very easy to use for both end users as well developers who are used in creating web applications or mobile apps using AngularJS (or any other UI frameworks like React).
The support is great too! They always respond quickly with their solutions & help when you need it most - usually really early morning hours during our work day :) No dislikes so far though which has been good but that could have something to do wtih my lack of experience working directly wit them ;) We're building an app where we needed some form-filling functionalities from time to time. This was done by us via simple HTML forms / input fields & javascript validation etc., however this process required quite alot more effort than expected once there were multiple people involved at times. So now instead they can be completed easily within minutes just through drag n' drop actions without having.