Several cell phone savy folks recommended Plantronics versus the Motorolas - so I trialed *3* Plantronics against my old H850. They are models: Explorer 350, the Discovery 665 and the Voyager 510. I must say that this middle priced range of headsets ($50-$99 for these 3) is the best - hands down! (Awesome price on Amazon by the way...)After paring them to my Blackjack (with AT&T; Service) I decided to put them through the ultimate noise test...I-5 Seattle. The other 2 models: the caller on the other end was VERY quiet with the volume maxed out, windows up and sterio off. However, the Voyager's volume was maxed and plenty loud and clear that a decrease in volume was in order. In fact, I challenged it further by rolling the windows down, sun roof up and the caller stated that she could only hear a minor difference in background noise ~ON THE HWY~. Saaaweeeeet!Since I didn't want to make it a trip to the state of Oregon, I decided to jump off of the freeway. Again, windows down -I added the radio noise on a low-mid volume. Wonderful! No complaints of echoing on either end, no break-ups (which could be b/c of one's service provider?) and the headset was snug and comfy.Other great attributes you might ask? The Voyager is fast & easy to turn on and to wear. I can also use it as a hands-free headset on the business landline if I buy the cradle.Yes, it is on the larger side, but you don't notice it when you get used to it. Besides, the other ones feel a lot less secure on the ear nor are they able to reach the audible part of one's face as well.My only complaint is that it doesn't come with a car or usb charger - just the wall charger. (The car charger can't cost too much dough.)Compared to the Motorola H850...all three blew this one out of the water. It would get an 'F' grade due to the high noise levels, occassional echoing and extremely low volume on regular streets.