I was thankful for GitX in the past, but there are many git clients I would recommend over the ancient and no-longer-evolving GitX (even the venerable brotherbard fork that saved the day when it was needed most--e.g., before there were any good clients competing in the market).
So far I have purchased SourceTree and Tower, both of which are a lot better than GitX, IMO.
I'll be giving Sprout a whirl, too--looks good from a skim of the web page. (And the new name is much better!)
We shared this with HN when we were first starting out[1] (in pre-beta stage) and we just wanted to share the progress we have made and say "thanks" - as our awesome beta tester userbase was mostly HN readers.
https://github.com/brotherbard/gitx/downloads