I really like that my dishwasher has a window so I can peek inside while it's working. Besides the coolness factor, it's also useful to see whether any of the rotors are blocked from spinning or something tipped over.
It's not a deal breaker if you get one without a window, but it's really nice to have.
This is a great little unit. I had the same one, and gifted it to my friend who took over my apartment when I left. It was his first time ever having a dishwasher.