While the Waveform is designed as a shelf, we instantly saw it as a desk. The desk, perhaps, we would have purchased if a) we had wall space and b) we hadn't gone for the Offi Wave instead.
One of the main reasons it appeals to us is the length: at 22" long, it makes for a very minimal laptop or bill-paying station, which is often called for in a closet office or nook next to the fireplace. The other reason is the price: $350 is a lot for a shelf, but stays in contention as a desk.
More about it here.