I like MacHG and would use it more if I wouldn't be such a command-line junky.
For instance GitX has a nice feature: There is a menu entry "Enable command line usage ....". If that is called it installs a utility /usr/local/bin/gitx. No when I'm in a directory on the shell and I type gitx then the gitx application is opened with the git archive that the current directory is in.
A similar utility machg would make MacHg an absolute killer for me