I always like sourcetree, mainly because is the best mercurial GUI client I have used so far, and the ability to do git with the same tool is great.

I use the command-line for basic task, but the GUI is great for visualization and do stuff like diffs, conflict merge and other things.

However, lately sourcetree crash every time I open it, then re-open and it work (!). The tool is good enough to accept this so far.

But now I'm worried that this get worse...