I like Lee's idea about a direct comparison. It makes sense you don't have the Add and Delete content option in the CMS since the site is being built for you via an extension. Aside from that, are the features the same? If I were to add or remove pages via Site Sculptor the CMS is modified to adapt to the new site, correct?
I have to tell you that I was VERY excited to watch the video for Site Sculptor because more and more people want the ability to maintain content and your extension appears to make this a breeze!
Question for you: Is there a way that you can tie CSS into the edit features? Let's say the client wanted to add content for a new page. Instead of choosing a font size of 15, gold and bold, would I be able to define that as a "Header" in CSS that the client can choose from a menu instead of formatting all text from scratch every time? More flexibility would be great! Also for the image align options, having access to float (left/right) will make embedding graphics easier.