Well, I guess it is just a matter of opinion. Personally, I find really low-power systems irresistable. Low-power, saving on the energy bills, quiet, cool, and adequate for my needs.
Yes, I know, I have an Athlon 64 2800+, but this machine was bought early this year, when there weren't really any cheap choices for desktops, which offered better performance than my Athlon 1.1GHz which I was using at the time.