Just got mine. Semi-odd note on shipping, it arrived at the local FedEx on Tuesday night, got shipped from there to the USPS this morning, and found its way to my mailbox this afternoon.
Smaller and lighter than I expected. Says you're supposed to charge it completely before using, but I couldn't resist listening to a few seconds of music to see how it sounded before charging it the rest of the way.
Pairing with my iPhone 3G, running 3.0 went perfectly smoothly (even though this is my first Bluetooth headset and didn't really know what I was doing, aside from reading the provided instructions). Music sounds good, and I like the variety of 3D effects. Haven't made any calls.
A note: Fast forward and previous skips WILL NOT work with the iPhone or iPod Touch. See this Apple chart of supported Bluetooth profiles and read the footnote: "iPhone and iPod touch (2nd generation) support pause, play, and stop for AVRCP". I couldn't even get that to work, but that may be due to the low charge on the battery at the time or something else.
Haven't used it beyond just a couple seconds, but preliminarily, at least, I'm happy.