I bought this a year ago and have used it everyday. I talk on the phone all day as a telesales person. I tried all of the wearable options, over the ear, behind the neck, and headset. They were all comfortable, but I settled on the traditional headset after a few months of experimenting. It is so lightweight that I barely know I am wearing it. The sound quality is what you would expect from Plantronics, excellent! A few days ago my granddaughters came to visit (I work from home) and they got a little loud in the adjacent room. I had forgotten to close the office door before starting a conference call. While I could hear the noise, no one else could. The noise cancelation eliminated all of the background noise. You need to buy a cable to go from the Quick Disconnect (QD) connector to the phone you intend to use. I use my iphone. My only concern is that I have had to replace the cable from the QD to the iphone. However since I use this so much and connect and disconnect from my iphone multiple times each day, I figure i just wore it out. However the wire from the Hw540 to the QD has never given me any problems.
I started out using my Plantronics Bluetooth behind the ear device. However I didi not want to have a radio transmitter next to my head for 40+ hours each week. i am very satisfied with HW540 and would highly recommend it to anyone wishing to have a wired headset.