Got myself a pair of Rizoma, pricy but good quality, also brough the Rizoma bar end which is a direct fit with our Guzzi.
I have the ebay-chinese knock-off version of these. Pretty good quality considering the cost. Hardware was cheesy so I changed it out with stainless from Ace. For a relatively small mirror, they work well. No vibration to speak of and good quality glass with a slight blue tint.
Pretty much all the Rizoma models are available on ebay as knock-offs.
If you do a lot of freeway commuting (I don't), I think it's worthwhile to get a large mirror like the napoleons. If you spend a lot of time in traffic, I think you'll appreciate the larger field of view.
