Thankfully i did NOT spend my money on this headset. It was a gift. My bottom opinion on the Jawbone Aliph Noise Shield is this; don't waste your time or money. Why?For the price of this headset from Jawbone themselves (when it debuted $150) , you would assume the quality would at least be "good" on the scale. You would be wrong. Its bulky and would not stay in my ear more than 10 minutes with much adjusting just to either keep it in or try in vain to find a comfortable position, as well as the fact it took forever to get it in there. None of the earbud covers are comfortable as stated above; after 1 hr of talking my whole ear hurt.Don't move if you have this in your ear either as you will have to readjust it; or it will fall out all together.As for functionality, it fails to impress. The call quality might have been good had i been able to hear my caller. The max volume for this was very low and muffled. Noise cancellation depends on the headset sitting flush on your cheek at all times...which it dose and will not do. My caller said when i scratched my cheek it sounded like i was rattling plastic right next to my face.The buttons also do not impress. What buttons there are anyway. The Jawbone Aliph follows the "minimal" design that is so popular which i do not mind...when done right. The call button is multifunction (e.g off/on, call/redial/hang up etc. ) when you can find it. The volume button sits right next to the call button on the black part of the headset. Good luck deciphering which is which, as well as being able to tell if your pushing it. The on off beeps are indecipherable, as well as low battery.It may be different for some as i never had this thing in long enough to get used to the sequential beeps.All in all this headset is one of the worst i have had, i can honestly compare the quality of it to one that would cost me 20 dollars at walmart. Please don't waste your money on it. I would recommend the Plantronics 957 as a replacement as it at least holds up to the quality you would expect for the price.