Works very well. Sounds is too loud on max volume and most people I have spoken to can't tell I'm on handsfree.
It loses 1 star as it does not re-connect when you turn it on (open the mic flap out). I found that just pressing the call button after the unit has switched on connects it to the phone without having to access the phone menu!
I have used it for roughly 3 hours of calls over 3 weeks and have only charged it once on the day I got it. Even more impressive is that I often forget to turn it off so it has been left on over night many times.
For £13.50 you really can't go wrong, buy it!