A:Answer The sound in these is /really good/ for bone conduction headsets. Midrange to highrange is very clear, and just pops, voice is perfectly clear, and the volume is quite decent.
The downside is that bone conduction headsets are not great for bass. I estimate the sound cuts out at about 40Hz, compared to 20 Hz for normal headphones (and 5 Hz for good ones). The 'speakers' may be able to do lower frequencies, but then it has to go through your tissue, which tends to muffle sounds. You will get better sound quality on good normal headphones.
On the upside, since they don't cover your ears you can still hear everything. This makes them a godsend for when you're biking, running, or walking, because you won't be one of those completely oblivious dopes who can't hear anything around you. Plus, headphones or earbuds can get kind of sore or sweaty after a while (especially while doing active stuff), but these just sit in front of your ears and I can wear them for hours without getting tired of them.
I turn up the bass boost a bit, which helps, and accept a little less bass for the freedom.