I recently installed CRG bar-end mirrors and they produce a crystal clear image. The mounting is an aluminum construction that goes inside the bar, but they don't vibrate or come out of adjustment on their own. They also don't protrude as far as the other bar-ends with larger stems.
That being said, their location is not ideal, as I have to take my eyes off the road to check them. The OEM mirrors are better functionally, but the CRG are a good compromise for looks and function.
They're expensive, but you can find discounts if you search ebay or shopping.google.com. I got my pair, with mounting brackets, for about $100. Normal retail would be about $200.
Jeff