Quite simply, the Aliph Jawbone Noise Shield Bluetooth Headset totally rocks! Believe me, I've gone through quite a few Bluetooth headsets in the last couple of years, and so I have quite a few to compare this one to.First off, the design of it looks a bit off-putting. It uses military-grade noise reduction technology and the look of the headset makes me believe that this particular headset may have been originally intended for such use. It's not exactly the most attractive headset out there - definitely not the most feminine.But to be completely honest with you, after trying a number of `prettier' headsets that either break easily, lose their pairing with the phone frequently, or just plain don't work as well I am all for sacrificing form for function.All that said, while it may not be the most aesthetically pleasing Bluetooth headset, it is not the ugliest either. It is interesting to note the design differences in the newer Jawbone model that Aliph just released, however. They've presented a much more attractive version with a sleeker, less obtrusive style, seemingly proving that the manufacturer recognizes the customer's desire, frivolous though we may be, for a headset that is pleasing to the eye.Now for the important part: how it works. The Jawbone was simple to pair with my cell phone (HP iPaq 6945 Unlocked Cell Phone with Wi-fi, GPS, MP3/Video Player, SD--U.S. Version with Warranty (Silver)), as most Bluetooth headsets are. More importantly, I've paired it once and it has maintained that pairing without issue ever since, unlike the previous headset I owned which lost its pairing at least once a week, usually while mid-conversation. This is annoying, certainly, but for a user that won't use their cell phone while driving without a hands-free device, this is very unsettling. If I wanted/needed to continue a call while on the road, I disconnected the call, pulled over to re-pair the two devices, and then started my call and my trip again. This is a major issue for me, so I am extremely appreciative of Jawbone's reliability.Next feature: Noise Reduction. Aliph makes a big deal about their noise reduction technology, and having now used it with amazing results, I understand why. They DESERVE to tout their success in this arena. Yeah, it is that good. Watching the videos they have on their website demonstrating the quality made me curious, but I admit to having my doubts that it could really eliminate background noise to the extent that they promised.I've purposely stress-tested it in some pretty noisy situations. First of all, my own vehicle. I have an older car, and it seems to pick up all of the outside noise there is, even with my windows up. If it is raining, my callers could hear the rain on the windshield when using other headsets. When a semi drove alongside my car, the noise of the big truck distracted my callers from our conversation.Aliph's Jawbone headset changed all that. My friends and family no longer even suspect I'm in the car when I use it. If they call me while I'm in a grocery store or department store, they hear neither the hubbub of the store nor the announcements over the building intercom. Then I went to my favorite wing restaurant, which keeps the music pretty loud. I stood directly under one of their speakers and asked my friend if she could hear it. She thought she heard some people speaking faintly in the background. She had no idea I was standing under a speaker with music blaring at me.As for the fit of the headset, it is very secure on my ear. Like most others, it hooks over the ear, which makes it fit a bit oddly with sunglasses or eyeglasses, but it isn't uncomfortable. When I get a new headset/earpiece, one of the first things I do is to put it on and shake my head around a bit to test how securely it fits my ear. This one didn't budge. For me, this is a very important factor. If I can't move my head naturally as needed while driving, then the headset impedes my ability to drive and I won't have that.Some of you probably want to know about how it charges. I use mine quite a bit for both personal and business, and it isn't rare for me to wear out the charge before the day is out. I've only managed to drain my Jawbone twice, and it charges so quickly that I was able to use it again within an hour or so. It comes with a cable that can charge through an electrical outlet or a USB port on a PC. It does not have a car charger, but since I have a power inverter for my car, I can simply use it to charge it while driving should the need arise, so this isn't a deal breaker for me.All in all, I highly recommend the Aliph Jawbone Noise Shield Bluetooth Headset. When I finally break or lose this one, I will look at replacing it with another Aliph model before any other manufacturer.Most recent Headsets I've used:Plantronics Discovery 925 Bluetooth Headset - BlackJabra BT250v Bluetooth Headset with Vibrating Alert [Retail Packaged]Logitech Mobile Freedom Bluetooth HeadsetMotorola H300 Bluetooth Headset