For sure. But someone like myself coming from a current iMac or someone coming from a laptop without a monitor, a monitor purchase would have to be included. Sure you could go with something cheaper than the ATD.
I like the idea of the ATD because it will work well with my MBA as well as my new mini via the included ports. I worry about having a working system at all times since I need one for work, and being able to swap out the Air for the mini in case of trouble is very attractive. I also keep multiple, cloned backups, so it would be effortless to slide the Air in place and boot off the clone.
What's making me a bit hesitant is a sense that an update is just around the corner combined with saving a few hundred bucks.