Customer Rating: 
Summary: Excellent corded headset
Comment: I will keep this short.
I love this. Great sound in and out. Mute. Variable volume control that works very well. The comfort is good. The design is unusual but it works for left or right. adjustable mic position. Good wind blocking. Never any complaints from the receiving party.
I have had 2 of these. I ruined the first. In the end I liked it better than all the other corded headsets and went back.
I would recommend this. I am very happy with it.
Customer Rating:
Summary: surprisingly great wind reduction
Comment: This headset has wind reduction that works GREAT. I can drive on the freeway with the windows down and trucks going by, and the person I'm talking to can still hear me clearly.
The reduction works best on wind, or noises that sound like wind (kinda white noise). So it doesn't reduce noise as well from, e.g. nearby radio music or loudspeaker announcements in the mall.
The headset has a mute button, works well, convenient. The mute function is a mechanical switch (not an electrical button). The indicator that lets you know if it is muted or not is a red/green tab - it doesn't light up, hard to see in the dark.
Also, the Amazon overview says that this headset has a call answer/end button - it does NOT. If you really need it, try the MX510-X1 Plantronics MX510-X1 Mobile Headset for most phones with standard 2.5mm headset jack - Audiovox, Bla - it is a similar headset that DOES have a call answer/end function.
Customer Rating:
Summary: Plantronics the best but this model not that Good
Comment: Plantronics is known for making the best headsets but this model does not live up to that standard. The design is great but the clarity of voice (mic.) is low grade and the volume of voice sounds to your listener like you're talking into the mic. from another room.
The purpose of this feature is to reduce background noise but I find it to not be usable for regular conversation is a quiet environment.
Customer Rating:
Summary: One BUTTON short of perfection.
Comment: Amazon review of this item is wrong. It DOES NOT have a button that assists with making calls. Thing ONLY has a MUTE button. I was tricked. Anyhow, I still love it more than the headset I bought from sprint that keeps falling out of my ear. This headset is super comfy.
Customer Rating:
Summary: MX150 rated better
Comment: I recently purchased both the MX505 and the MX150. According to the people I was talking to, the 505 had more "running water" sound in the background, making it harder to understand me. Keep in mind I'm a truckdriver often talking to other truckdrivers in noisy environments. At home in a quiet environment, it worked great attached to either my cell or my cordless phone.
Summary: Excellent corded headset
Comment: I will keep this short.
I love this. Great sound in and out. Mute. Variable volume control that works very well. The comfort is good. The design is unusual but it works for left or right. adjustable mic position. Good wind blocking. Never any complaints from the receiving party.
I have had 2 of these. I ruined the first. In the end I liked it better than all the other corded headsets and went back.
I would recommend this. I am very happy with it.
Customer Rating:
Summary: surprisingly great wind reduction
Comment: This headset has wind reduction that works GREAT. I can drive on the freeway with the windows down and trucks going by, and the person I'm talking to can still hear me clearly.
The reduction works best on wind, or noises that sound like wind (kinda white noise). So it doesn't reduce noise as well from, e.g. nearby radio music or loudspeaker announcements in the mall.
The headset has a mute button, works well, convenient. The mute function is a mechanical switch (not an electrical button). The indicator that lets you know if it is muted or not is a red/green tab - it doesn't light up, hard to see in the dark.
Also, the Amazon overview says that this headset has a call answer/end button - it does NOT. If you really need it, try the MX510-X1 Plantronics MX510-X1 Mobile Headset for most phones with standard 2.5mm headset jack - Audiovox, Bla - it is a similar headset that DOES have a call answer/end function.
Customer Rating:
Summary: Plantronics the best but this model not that Good
Comment: Plantronics is known for making the best headsets but this model does not live up to that standard. The design is great but the clarity of voice (mic.) is low grade and the volume of voice sounds to your listener like you're talking into the mic. from another room.
The purpose of this feature is to reduce background noise but I find it to not be usable for regular conversation is a quiet environment.
Customer Rating:
Summary: One BUTTON short of perfection.
Comment: Amazon review of this item is wrong. It DOES NOT have a button that assists with making calls. Thing ONLY has a MUTE button. I was tricked. Anyhow, I still love it more than the headset I bought from sprint that keeps falling out of my ear. This headset is super comfy.
Customer Rating:
Summary: MX150 rated better
Comment: I recently purchased both the MX505 and the MX150. According to the people I was talking to, the 505 had more "running water" sound in the background, making it harder to understand me. Keep in mind I'm a truckdriver often talking to other truckdrivers in noisy environments. At home in a quiet environment, it worked great attached to either my cell or my cordless phone.