I run two machines, so my desktop computer uses config_dt and my macbook pro 11,1 uses config_mbp. i3 picks up the right one by using a symbolic link, for example:

ln -s ~/.i3/config_mbp ~/.i3/config

I've made a few additions to the default config file. Most lines I've added or configured are in sections denoted by:

# -------
blah settings
# ------

i3 is awesome. Well, it's not awesome, but it's even better.

• It is somewhat optimised for an Apple Wireless Keyboard (config_dt uses eject key on kbd for shutdown).
• To use the status bar configuration, create a symbolic link from i3status.conf, hidden in home folder:

   ln -s ~/.i3/i3status.conf ~/.i3status.conf
  

• Place i3exit in ~/bin/ and ensure it is executable.

• Two scripts are included to change the keyboard backlight using the keys. Follow instructions in kbd_backlight_up.
• The screen brightness controls require xbacklight, installed from apt.