Define "works"...
Will you get track names? Nope.
Will you be able to use it for music and handsfree? Yes.
I have an mw600 and its pretty awesome, works very well. Much simpler to pair than most bluetooth devices ive used in the past, and can pair with 3 things, so i use it for my laptop and my phone.
Only negative point is the clip really, it doesnt open quite as wide as i would like, and the spring isnt very strong (it isnt weak though).
Oh, and the "touch sensitive" volume control is utterly pointless! A rocker switch would have been better.
Once all is said and done though, i paid £40 for mine and im still very happy with it so for £30 you cant really go wrong.
It doesnt seem to affect battery life in any appreciable way and the sound quality was indistinguishable from the 3.5mm jack. (On an x10)