I've now tweaked my make files so they are almost unrecognisable from the twitter ones, it can run PHP, JS unit tests, fires up phantomJS and tests individual modules, can release minified for production, or not for debugging purposes. I can't stress how useful it is being able to just add a line and you get such powerful support.
I haven't had time to add git hooks yet, but thats the next stage, I plan to set the hooks to run tests and clamp down on poor quality code (I work with interns quite often... sometimes I cry for just average quality code coming in).
For a story of the production gains I've had. I moved the whole company CSS into a CSS preprocessor and cleaned up all the existing structures to fit the make file release procedure. It came back a thousand fold away a rebranding and I had everything done in two days. I was blown away with that alone, I've been involved in so many rebrands over the years that go on for months... not hours.
Do it, if you're bit unsure where to start check the twitter bootstrap build file and muck around with what they have done.