Ranked in these QuestionsQuestion Ranking
Pro Code is visible
Generated code is visible and can be edited as a result.
Pro Drag 'n drop components
Common components are provided via drag 'n drop interface.
Pro Custom styling support
Looks like there's an elaborate UI to style elements.
Con Not feature complete
As a replacement for a full builder/designer solution, some features are still missing. You will need to build out your own toolchain.
Con Marketed as a framework, mainly for templates
It's more geared towards templating and use in CMS solutions.