Personally, I find these aliases a bit too terse.

Aliases are important for enhanced productivity, but shell aliases are too much. I find these git aliases much more comfortable:

    alias.st=status
    alias.co=checkout
    alias.com=checkout master
    alias.cam=commit -a -m
    alias.cm=commit -m
    alias.br=branch

push, pull, merge, rebase and the rest are infrequently used, so I don't alias them at all. Using shell aliases (as opposed to git aliases) is unjustified IMO, as is the horrible

    alias g='git'

which gives me the creeps.