I also stick with Woothemes as the one better marketed. As an example, on blue Host, as soon as you finish installing the wordpress through cpanel, a woothemes' banner shows up.

Studiopress definitely has the better support, however their designs are getting outdated and not following up with the others. It is time to stop moving divs around and start designing new themes.

All the others lack of something. Whether is the support, the code sucks, the owner sucks or they are breaking the GPL license etc and etc.