Wanted: Male-worthy diaper bag

Today was Lizzy's baby shower in Austin and one of the gifts was a diaper dude messenger bag. I chose this one when we first did our registry so I am glad it was given to us, but I have a general question.

Is it really needed? I have heard mixed reviews about whether an actual diaper dude-type bag is needed, or if you can get away with a regular laptop messenger bag and just keep the needed supplies in there.

Here is my bag:

Dads? Moms? Can you give me your opinions on the subject? Maybe recommend a brand and/or product? Am I good with my diaper dude messenger?