Most of the editor’s shortcomings are image-related, even for basic functions like cropping. You can resize an image, but that’s it. In addition, getting at the HTML and CSS is a bit of a pain. It can be done, but you’ll need to save your message as a template, then edit it as a template, save your changes, then start a new message using that template. It works, but you’ll waste a lot of time clicking and scrolling.
In my opinion, Aweber is The Best email autoresponder on the market today. As someone who is a HUGE FAN of Aweber, I find it sad that you left them without calling customers support OR MYSELF, JUPITER JIM, (on skype, of course) to help walk you through things. It is so easy, breezy when they just walk you through everything step-by-step over the phone.