It is really useful if you want to render those more user-friendly.
Twitter Bootstrap is a well known front-end framework. Version 3.0 has been published this week with some good improvements and they switched to "Flat" design.
Sadly, x-editable is not yet compatible with this version of Bootstrap. At least, the pop-up mode is not working. If you still want to use x-editable but can't wait to upgrade to version 3.0 of Bootstrap, you will have to switch all your inputs to "inline" mode:
$.fn.editable.defaults.mode = 'inline';