I can only vote for the Shockz. Got several from them and they're my everyday companions.
Especially while work, I can listen to my shit, while my ears are open and I hear when I'm being called. At night, I can listen to some podcast, while I don't disturb my girlfriend.
I really love them. Sound quality is very good enough. Of course, don't expect pro audio levels, but they're way enough for "casual listening". Voice quality is wonderful, for listening to music, it is average, at all.
I haven't tried any other bone conducting, so I can't compare.

Confirm. On the other hand, having this stat line on a common card, is quite cool. This could be a Golgari staple, while it being common will have it stay affordable.