Ingo Molnar wrote:

for example git-bisect was godsent. I remember that years ago bisection 
of a bug was a very laborous task so that it was only used as a final, 
last-ditch approach for really nasty bugs. Today we can autonomouly 
bisect build bugs via a simple shell command around "git-bisect run", 
without any human interaction! This freed up testing resources 

..

It's only a godsend for the few people who happen to be kernel developers
and who happen to already use git.

It's a 540MByte download over a slow link for everyone else.

-ml