I tried two Motorola BTs (H371 and H700), then this one, because of all the great reviews. While I have small ears, this was the best fit and felt the most secure. I can shake my head and it doesn't fall off!The H371 was not too bad, but the other person always sounded very far away, even when I maxed out the volume. The H700 dropped the connection to my phone all the time. Additionally, it would periodically have a deafeningly loud static and I would have to rip the thing out of my ears because the static hurt my ears. It was that loud.Glad to say that the Plantronics 510 maintains a flawless connection to my cell and with no static during normal use. Of course, there is static the further I am away from the cell. I don't think it has 33ft of connectivity. I think it starts getting staticky about 10ft.The only con I can think of is that the earpiece is a nice, soft windsocky thing, BUT it makes my ear itch sometimes. An easier to use mute button would be nice, too.Finally, a nice feature is that you can actually turn OFF the blinking led. When powering on, press the power and the Volume + (make sure you press the + side of the volume button) simultaneously. As soon as the LED blinks once, let go. The LED will not blink again unless you're out of range of the cell. Once you're back in range, the LED stops blinking.I would highly recommend this product. Itchiness and all!EDIT Jan 2, 2012When I bought this price was around $44. I would have passed had it been $150. Is it worth $150? I don't think so.