After having Motorolas, I was slightly discouraged about BlueTooth headset technology. I made a (poor) assumption all brands would be similar in sound. My Motorolas were very difficult to hear, so much so that I wouldn't even use it for driving (the main reason for gettinig it). I was recommended the Voyager 510 by a co-worker. This headset is plenty loud to hear while driving even with radio turned up and A/C fans on high. The noise cancellation mic is quite good as well. Its a very comfortable headset for having an ear insert.4 our of 5 stars because of the power button and volume controls. They are quite small and if wearing the headset, they are a little difficult to find behind your ear.