Pros: easy to use, long battery life, can be charged using USB port, light weight, clear sound, reasonably priced, no interference even in busy city environmentCons: mediocre sound quality, cords are too long, 2.5mm connector instead of 3.5mm on most headphones.Had it for about a month. Overall this unit works well. Easily paired with my iPod touch and Sony phone. Sound quality for voice conversation is great. Although I'm not a heavy cell phone user, I haven't had to recharge the battery in the past month. Bluetooth signal is very stable within as far as approx 20ft (indoor). No unpleasant background noise was heard. Stereo sound quality is somewhat dissapointing. The earbuds are made with cheap plastic. No left or right, except one of them is on the longer side of a "Y" cable. Frequency response range seems to be narrow in the middle, i.e. highs and lows are lost. Thought I could replace the headset using my Sony headphone. But I knew I was wrong right after I received it. The connection is a 2.5mm plug, not 3.5mm standard for headphones. Plantronics does provide an adapter cable to convert 2.5mm to 3.5mm, but it adds at least another 3' to the already-too-long cable. What makes it worse is that the volume control is completely lost when Sony headphone is connected using the adapter cable. Music volume is pushed to the highest, which makes it unusable. So I had to switch back to the default headset. The price is reasonable, that's why I'm keeping it, as I need a bluetooth set for voice calls, and occasional music when I don't have my Sony/iPod with me.