I am a previous user of the Logitech Mobile Freedom headset (lost from dropping it in a movie theatre) and of many others so I do know what a bluetooth headset should be.First impressions: I liked the size of the headset and the spiffy metal case where you can store all the included trinklets. They even give you a mirror on the back of the case (I guess so you can see how cool you look with the headset). Out of the box, it's easy to setup. Took about 1.5 hrs to charge the headset.Pros: This headset is light, small, and well designed. The ear gel isn't intrusive like the old Jabras. I would say it's like an earphone that you would use for mp3s, except it's made out of rubber which is good so it won't slip out. they give you 2 other gels if the default doesn't fit. I have a small set of ears, and the default is perfect. It pairs easily with my LG PM 325 (Sprint Phone). I don't notice a difference between this and my old Logitech in terms of sound quality, meaning the quality is excellent. They heard me, I heard them, it was clear, no static. If you DO get static it's just the downfall of BT technology (wi-fi, walls, or microwave interference). It also comes with 4 different charging attachments for Motorola, Nokia, Siemens, and Sony Eriksson. You can also use the power adapter they supply which works well. I like the pen/marker sized charger you can put it in, and though I can't see myself using the AAA battery option to charge, it's great to be able to charge it anywhere if need be.Cons: Well, here it is: I wish there was a wind guard. This would be a great feature to have since it's so mobile, and wouldn't it be better if we could use it outdoors? Foam isn't that expensive to add... Secondly, there should have been noise reduction feature. Trust me, it pick up everything; dishes in the back, people talking, stereo, blah blah. Oh well. Otherwise it's great. . Other than that, the price is the biggest con. I got it here when J&R; had it for $69. But $89?! Ridiculous. Even $70 is high for a BT headset these days. But hey, you pay for the look, feel, and fit.If you don't care about obtrusiveness, get the Logitech Mobile Freedom. It's cheaper. One thing that was different is that the Logitech after finishing a call, sometimes it would disconnect from my phone (the BT connection I mean) which was annoying if I wanted to make another call right away. With this plantronics 640, I don't have that issue which is awesome!