I chose both, blue for the mechanics tools, black for the machinist tools. I also have some Red Harbor Freight - they have the miscellaneous stuff in them.
By the way the Extreme boxes are great! The HF are a great value, but nothing compared to the Extreme's.
manwithtools which extreme box do you have?
I too would like to know what makes them better?
Personally I think blue makes for a much nicer looking tool box.
So being that you own both HF and Extreme, the Extreme is hands down a better box? What is better? Some day I will upgrade to a 56" box and would like to know.