Its small size will fit on top of even the most crowded desk, and it offers wireless access when connected to a Wi-Fi router (via the Gigabit Ethernet port).
Why waste desk space on a device whose entire point is that it has no user interface, no display, no keyboard? The Home Serer lives in the basement, stores data and makes no fuss. That is the point.
I bought the 500Gb version and added a couple of 1Tb drives. These days the 1Tb model is priced better and might be a better bet. Whichever one you get you need to buy at least one extra drive so that you can use the data mirroring function.
There are still some rough edges on WHS. For a start there should be a method of backing it up to an offsite location.