lot of apples-vs-oranges in this discussion, e.g. simple graphical / browser controlled setup of 100% of all NAS functions, including time machine backup, multimedia serving, remote access, etc., to avoid having to using the Linux command line. Though I used Unix/SunOS for years professionally, for a SOHO / home NAS, I wanted an obvious browser based user interface for ALL setup/admin functions. That wasn't possible, in my assessments, with freeware.
Re windows server essentials: If it stays at $450, consumers won't buy it or a hardware bundle. But I guess HP didn't sell many WHS even at that 1/10th price.