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!)