I have one and I love it! That being said, the size of this thing makes it a little too big for a regular roll cart. I just leave mine parked next to my regular box and I use one of these for my "roll cart"
If I were to buy that box you are talking about over again, I would get the one with the sliding top. It ***** when you have tools sitting on top of the box and you have to pick the top up to get inside.
Brian