I tried quite a few HTML5-based themes before Suffusion, and I have to say it is by far the best. Nothing else I tried had anywhere near the number of useful customization options, and no other theme I tried made my blog appear the way I wanted it. Yes, the options are a bit scattered, but I was able to find everything I needed, and it all just works. I even received a comment on one of my posts asking me if I was using a free or paid theme, and expressing enjoyment of the appearance of the theme as well as the content itself. Of course I linked to Suffusion in my response, as well as to the GPL license. I greatly appreciate the work that went into this awesome theme, as well as the freedoms that come with the license to use it.