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This review is from: Plantronics 83600-05 M100 Bluetooth Headset - Black (Accessory)
I use this with an iPhone 4S and Blackberry Bold 9790. I find the ability to pair to two devices (multi-point) really useful and the battery life is good too. My only criticism is that in high ambient noise environments, such as when walking beside a busy road it is a little quiet - I have decided this is simply as it is not a true in-ear design. I do use it more in my office, leaving my hands free to type etc. Would recommend this to anyone and at ~£30 it is a bargain!