The code for creating components can be seen in the source itself, which makes it easy to customize your UI even if you're not an expert coder.
Although I love how simple this component library is with so many ready made components already available that are of high quality. There's nothing much I dislike about this product as such, but some things could have been better like documentation (which should definitely improve), pricing & licensing model. This was really helpful when building my first website with drag n drop features without using any front end frameworks or plugins.