I think it's true. But unfortunately the price is too expensive for me. Moreover there are many free themes are also nice and easy to modify.
I am Thesis User! Its an awesome framework and Good in SEO, It is Also easy to Customize and edit Thesis! Belive it or not I removed almost 20+ Plugins after using thesis theme!
I guess so, even Matt Cutts uses Thesis, but to me, if i don't earn money enough from my blog, i would not go for Thesis, i would use another free version from Thesis, like neoclassical, cutline, or copyblogger theme, the creator is the same.
Thesis is a great theme but why pay for something you can do for free? Atahualpa is an excellent free theme that has a ton of options to customize the style, layout, and various properties of your site, including SEO. Also... install the All-In-One-SEO pack plugin and learn how to correctly use header tags and keyword placement throughout your posts and pages. Your content is going to be the most important SEO tool. Without good content, no theme or plugin created will get good rankings.
Thesis is really good, but if you using another theme, you can use plugin All in one SEO to improve site's seo. Don't use if you don't like it!
Thesis is a nice theme. It's not the Holy Grail of blog themes. You can do the same thing on just about any other well coded theme. Thesis is great if you aren't very experienced and need everything labeled to tell you what to do. It's no better for SEO than any other theme with the right free plug ins. Buy the theme because you like the other options, not because of SEO. It will not give you any more juice than any other theme that is set up and used properly.