As I said in another comment, I think this is much better and more convenient. The placement of the power button on the old Mac mini would cause me to accidentally push it every time I tried to unplug a cable or something similar. I would use one hand to hold the body of the Mac mini while using my other hand to disconnect something, and the hand holding the body would accidentally hit the button. It was a pain in the ass, having it on the bottom eliminates that issue. And since the button rarely needs to be pushed anyway, this is a better, more convenient, upgrade.