Stereophile gave a
glowing review of these a couple of years ago. (Of course, if you know the magazine, it seems like most products reviewed get glowing recommendations -- but I think they generally have good loudspeaker reviews.)
What I have heard about the Primus 150's in online audio chatrooms is that they are borderline too bright, but that they have incredibly revealing sound for their price. Not perhaps a wise choice to pair with a cheapo receiver and/or a computer's soundcard output. They do have a very high level of technology for their price. You certainly couldn't build your own at the full MSRP.