I have a drawer of rejected bluetooth hardware. This one, will not be added to the pile. I thought I would give this model a try as a replacement when I lost one of my HS850 models. I worried about its super tiny size and the performace output. I am not disappointed, in fact, I am delighted with this little unit.*Lightweight, very comfortable on ear. Because it is tiny, it does not have the weight to make it flop around on my ear or against my cheek.*I was impressed with the battery life of my HS850s, averaging 5-6 hours of active use, but this one far surpasses it with a first day talk time of over 10 solid hours and was still going when I hung it up for the day. Superb battery life.*Similar features as HS850. I will have to read how to turn off flashing lights, I hate the attention they bring. What do I care if it is a slow or fast blue pulse for active or nonactive, I cannot see it on my ear! People look at me like a freak, or complain that I am on a call, when I am not, because I walk around with it active to catch calls as they come in.*Favorite feature: the VOLUME! Other than a premium in the ear Bluetooth (Plantronics)I have used - and only quit using because after duration it causes great inner ear pain - this is the first bluetooth I do not have to shove against my ear while driving or in noisy environments (such as a store). What is the point of handsfree use if I have to hold one hand against my ear to hear? This one has not been above volume 5 yet (max is 7), and others say I am coming through loud and clear enough.*As with all bluetooths, because of the extreme amount of frequencies there are now days in the air (microwaves, wireless remotes, wireless laptops/computers, wireless phones, iPods, etc.), the bluetooth signal will break up when moving too far from phone. I can usually move around to a few rooms of my home before the static. It is not any better or worse than any other bluetooth I have used.Bottom line, a great bluetooth, this merchant is the cheapest around for this model number, and not a junky refurbished unit either, like others I have ordered in the past elsewhere. Very pleased.