I had to use this for a client project once (per their request) a few years ago and as a developer it was an absolute nightmare. But I guess it's not meant for developers...

There were so many quirks and limitations that I wouldn't ever recommend it to anyone. It's to app development what Macromedia Dreamweaver was to web development back in the day, except worse because you can't edit the code.

I don't want to be overly negative so I'll say that I do see value in it for those who have no technical skills or programming knowledge to create some sort of prototype, but that's about it.