Hard to rate accurately on 5 star system;My Rating: 8.5/10Ok..I've only had the Jawbone for two day, but I am very impressed so far. This one deserves a more in-depth review. After a lot of research and comparisons it came down to this one and the BlueAnt Z9, and decided to try this one first based on other reviews.I am a Network Admin and I'm usually working in close proximity to 30 loud servers. Working with tech support on a cell phone in this environment is next to impossible. With that said, I was obviously looking for noise cancellation. Well after seeing the videos on the Jawbone website and Youtube and many other reviews, I really liked what I saw and jumped in. Well here is my opinion so far:Pros:- Good voice quality to and from caller- Good noise cancellation (see conclusion)- Good accessories (multiply sized ear loops and buds)- Easily paired with my cell phone (BB 1700i Nextel)- Paired with my GN6210 bluetooth LAN connection base! (just a plus)Cons:- A little pricey (but "you get what you pay for")- Hard to put on, ear loops are stiff metal and don't bend- Bigger than most other brands- Rectangle Design (slowly starting to grow on me though)- Nextel two way has a 1sec sync delay (common, my other set did too)Conclusion:Great headset! However just as a note, after watching the videos online, to me the noise canceling is about 85% of advertised. I tested it with my head inside a 20 server rack which worked very well(you techies know how loud that can be). Also in a car with the stereo turned up and the windows up then down, not so good results with the closed in radio noise even with the windows up. Good with radio at normal volume though.Also, I got really frustrated with it at first because the quality wasn't even 50% of what I expected. When I first tried on the Jawbone I couldn't seem to get it on my ear. I have a larger head and ears so I immediately changed the ear loop to the bigger one. Well that ended up being the problem, it didn't fit tight enough for the sensor to press against my jaw good enough. Switched back to the smaller ear loop and the sound quality and noise cancellation work a lot better. However, that makes it a lot harder to put on. This is a headset for those who will leave it on all day or not need to take it off very often. However, it is fairly comfortable to wear for hours at a time.Results:- .5 point deduction for noise cancellation, which is still probably the best on the market.- 1 full point deduction for the ear loop fit, VERY difficult to put on, although it will probably be easier after practice.Overall, I highly recommend this headset if it's even close to your price range....hell, even if it's not it's worth the splurge.Hope this helps everyone that took the time to read this.****** Post reviews...it's the best way help others ******