10 Second review:Type of phone/service provider: Blackberry w/ T-MobileGood:+ Size is small.+ Simple interface with earpiece.+ Easy bluetooth setup on phone.+ Good battery life.+ Comfort, weight.Bad:- Volume levels (see below for details).- Sound fidelity is sporatic.(90% okay, 10% garbled or unintelligible.)- Cost.Neutral:* Arguable whether this thing looks good on you or not.* Small size can make it easy to lose or chomped on by small kids or dogs.The Motorola HS 850 is very easy to use and the interface is fairly intuitive. Range is as advertised but I have not pushed it to the limit. I use it w/ my Blackberry and the complaint I have is with volume. I believe the signal strength is limited by my blackberry and the sound quality by T-mobile. That being said, I wish there was a way to increase the volume beyond the current capability. (Yes, there are easy to use volume controls on the earpiece but it's still not loud enough for me at max setting) Talking indoors is fine, but outdoor usage with regular city background noise is difficult. It did not get a higher rating from me b/c of this deficiency.Would I recommend to casual user? No, it's not worth the cost. For those who talk over 700 minutes/month, drive alot, or a techno-phile, it's probably worth it.