I have had this product for about 10 days now and purchased it on the back on the many good reviews. I'm sorry that I'm probably in the minority but I've been disappointed in it's performance. Great service from Amazon and the seller by the way.
The Good Points:- Good build quality, small, lightweight and comfortable, pairs and works like a dream with the Iphone 4, brilliant innovative idea to have a charging case as well.
The Not so Good Points:- Buttons a bit small and fiddly, but you get used to them, confortable but doesn't feel totally secure and call quality not very good.
I can hear the caller really well, but everyone I have spoken to says that the call breaks up or is slightly muffled and not clear. I'm not sure why this is as other headsets I've used have been perfect and my husband uses another make with his Iphone and that's fine too. I will probably have to speak to Plantronics to see if they can help (maybe my unit is faulty), but I no longer have the original packaging to return the product and feel I may have made an expensive mistake. I did expect much better.
I will review again at a future stage if call quality is resolved, but I would say at this stage take heed at this price point because call quality should be top notch and it isn't. I hope this review helps others as I've tried to be balanced. The product has much to commend it, but as the main function is to make and receive quality calls, then I feel my main gripe is fairly major.