On the other end of the spectrum we have the folks who are getting started with Git. Even using branches is a concept people have to get used to. Our goal with SourceTree is to make Git more approachable while still maintaining the power of the tool... and yes, that's not an easy task.
As the preview shows, SourceTree will see a number of changes over the next few months, and I'm sure we won't get everything right the first time. But we are convinced that, with your help, we can make SourceTree both approachable and powerful at the same time.