This is my third Bluetooth headset. I've used two Motorola Bluetooth headsets with lackluster results to say the least. People could me decently with the Motorola headsets, unless I had the window in my car open. Then the wind noise would drown out my end of the conversation. This problem could be solved by rolling the window up. This is not the biggest deal in the world so I was willing to make this sacrifice. However, the deal breaker for the Motorola headsets is the fact that I could hear NOTHING!! I had to push the speaker into my ear to hear anything; and this with the volume set to the maximum setting. My friends and family got tired of hearing "What - Huh?" from me. So, I had to find a solution.Reviews online said that Plantronics headsets were high quality and were sufficiently loud to permit hands-free conversations anywhere. So, I decided to order one. After having used the Plantronics Voyager 510 Bluetooth Headset for several months now, I have come up with my list of pros and cons as follows:Pros:- Designed to be used in either ear- Comes with 3 different ear buds to fit different ear sizes- EXTREMELY loud - This headset will hurt your ears if you turn your phone and headset volumes both to maximum- Good microphone that reduces ambient noise so that you can converse while driving with the window down and your partner will hear what you're sayingCons:- I experience static between my phone and the headset- No Battery meterFor those interested, I have a Motorola RAZR phone from Cingular that gets the WORST reception on Earth. I drop an average of 4-5 calls every day. So, the static I'm experiencing with this headset could be more due to my phone, rather than the headset.Others have mentioned some durability issues related to this headset. I've had it for about 2 months and have no issues. If this headset dies before a year of use, I'll update my review. But for now, this is the best headset I've used and is well worth a $40 investment.