I've used them by the Original Equipment Manufacturer (OEM) Seidio and paid $50 the first time. Lasted about a year until the cable coating frayed and shorted. The second time, I bought them from Boxwave for $25 and the nifty auto-coil ability is really useful. However, I've only been using them for about a month and it's showing signs of wear.The volume dial is extremely sensitive and can cut volume on one side or the other. It's highly annoying to have the volume at different decibals on either side. Really disorienting. As you slide the volume wheel, the static and volume changes on either side back and forth until you find the sweet spot. As the Treo 700wx has ridiculously low volume on all areas (headset, speakerphone, normal ear speaker), you have to keep it cranked all the way up, most of the time. I would have given it only 2 stars but the auto-coil feature saves some headache and is a nice touch.The microphone sits low on your chest, so you have to shout sometimes for the other party to hear you properly. That also means you can't be doing anything with your hands in front of you, be in a windy place, or in an echo-y area like a parking garage. It's a shame.