I have used these BT's for years. They have great clarity, range, and fit well. As a matter of fact, I believe they were discontinued because they work TOO well. If you can find the H670 or the H550.... buy it, you'll be very happy with it. The only reason I buy these alot is because I happen to lose them or leave them places and have to buy new =(, but that's my fault, not the product.