This plugin gives you enough to go with for adding basic forms with basic styling.
To go further, I hope they add more hooks for developers and better styling options. I didn't make a thorough search but did not find any action or filter hooks. I could not find any parameters for the shortcode other than the form id.
In terms of styling, every element had a class and an id, which is great. But break tags were hard coded between each line, which was a bit to overcome.