I had those - sold them, then I got the equvalent in TEX (Polished Stainless Steel) - much better quality and can be obtained from the UK for a comparable price to these (including shipping) - then I sold those and bought Raydot (replicas) - which attach to the windscreen from finishline. They seem a decent mirror - not 100% sure on the quality, they are pretty light weight, but look pretty close to a real one. They are tiny though!
I think its been mentioned a few times before but the bullet mirrors unless they have the extended base (which doesnt look that great IMHO) find it hard to see over the rear wheel arches.
Cheers.
