When I'm in a branch, it's very hard visually to keep track what are the changes for that branch:
http://s6.postimg.org/73sv9x1y9/screenshot_77.png

comparing with Git Extensions:

http://s6.postimg.org/nsub5tyjl/screenshot_78.png

things to notice:

1- all commits that "end up" in that branch have yellow background, so visually it's easier to follow up
2 - the branch line has one color (same as SourceTree) but all others are grayed out and that makes it really easy to visually check the descriptions.