Ive bought almost a dozen of these for personal use and for friends. Dont worry about the odd (nonovertheear) design, its very comfortable, especially if you wear glasses. The sound quality is good, in fact better than any cordless (i.e., Bluetooth) headset Ive used and Ive used many. However, what keeps me coming back is the incredible windscreen this unit has! Im a cyclist and I can use this headset while riding! Other than breathing harder, no one can tell Im zipping along with a 20 mph wind in my face. This is the ONLY headset Ive ever set that works in full wind. Im sure runners and other outdoor sports users would enjoy it just as much. Since it works so well with glasses, you can wear the MX500 and MX510 with your sunglasses, too. The only downside is build quality is just soso. Specifically, three problems 1.) the ear piece swivel can snap. This can be fixed with glue, but the unit can then only be used in one ear. 2.) the twopiece housing for the ear piece can split, rendering the unit useless. 3.) the rubber facing that goes in the ear can separate from the earpiece by peeling back, which can be trimmed. Be aware that the above quality issues came up during heavy use while cycling, so more gentle and occasional use may never see this issues. Other than some build issues, this is likely the best nonprofessional corded headset ever made (the stalwart Plantronics "StarSet" holds that title in the professional category). I dont work for Plantronics or anything (my review would be better if I did!) but I used to sell telecom equipment about a decade ago, so Im picky on my components performance and quality. http://garyadair.com/324638