Just want to throw in my 2 cents regarding my experience so far.
To the moment I own 2 MyThemeShop themes (schema and splash). I have used other wordpress theme services before (I still do), and I have to say that mythemeshop is one of the best experiences I've had so far. Great, user-friendly, clean code, themes and great and fast support!
It's a great example of quality backing up a business. I'm definitely here for the long run, and looking forward to trying other products.