I've had a pair on my desktop for a week and there's no buzz, but then I'm using them through an Audioengine D1. As for my review so far, here's an edited version of what I posted on Crutchfield:
"Great with a flaw for desktop use
The Audiostream review (linked on the PSB site) caught it mostly dead on: - "the PS1s sound exceptionally clean, clear and crisp" - "throw out a huge and stable sound image both horizontally and vertically" - "All frequencies sound very evenly handled" - "eminently musical and involving to listen to for any kind of music" - "Think smooth" (tweeter) and "delicate" (overall)
But then: "if I had one wish I'd wish for a bit more heft. A tad more weight to the lower and upper-lower frequencies"
Compared to the slightly bass enhanced and Class A amp of the Audioengine A5+, the PS1s are a little cool, but oh so transparent and not at all grating, unless it's there on the recording. Nonetheless, that lack of heft is a big drawback for me and, I suspect, will be for lots of other desktop users that don't want to add a subwoofer. Heft is important element of dynamics, and is lost when drums and bass don't quite sound (sufficiently) complete, i.e., actually like drums and bass, as they don't with the PS1s. if PSB had extended this quality of sound down towards 50 or 60 Hz, I would have gladly accepted a somewhat larger speaker and paid another $50-100. Maybe the next version? That said, although I haven't decided whether to keep them, the PS1 is appealing in lots of ways and certainly the right size for a desktop.
clean, transparent, delicate, lots of dynamics, sounds like music, does especially well on acoustic music and with smaller groups
lack of satisfying bass extension sufficient for a 2.0 desktop application"
I'd also add that the use of a power link cable between speakers, instead of employing standard speaker posts, seems to be a drawback, because it doesn't allow experimenting with speaker cables. With the A5+, getting rid of the supplied cable in favor of a fairly good quality speaker wire made a very noticeable difference. I also think putting the volume knob on the back will put off some potential buyers who don't have a DAC and don't find using keyboard or desktop controls that efficient.