Not really that useful.

It works, but I couldn’t find a way to do simple customization like adding a simple class to the image (img-responsive for bootstrap), or removing the implemented inline style of 100% width.

I guess you could use the cumbersome filters mentioned on the docs, or create a template, but by the time I figure out those, I’ve already found, installed and successfully implemented one of the wysiwyg widget text editors to do what I needed.