Summary: I make a lot of VoIP calls on my computer and the sound quality is expected to crystal clear (just like my $20 headset) but it was nowhere close. No it is not my computer connection either, I've tried connecting this to my Droid phone as well as my roommate's Droid. Same garbage mic quality... I would have expected this item as a prize in a Happy Meal.
Pros: Very lightweight, seems fairly durable, inbound sound seems pretty clear, battery life is excellent!
Cons: Mic quality is terrible. My 20 dollar bluetooth headset had better quality. I can hear people on the other end of the call pretty well (not incredibly clear, but no real complaints), but the people I am talking to say that I need to take my hand off my mouth or that I sound like a robot underwater. Tried to RMA with Newegg and the RMA was going to charge me 20% of the item cost to get my money back (since the product was discontinued, apparently I bought the last item).
Summary: Although others could hear me fine, I occasionally had difficulty getting clear sound through. Also - felt like it was going to fall right off my ear. Not a good or comfortable fit and the flip to answer was inconvenient.