My $10 Ebay China's are still holding strong and it's been 8k miles over a year and I drag-race my girl so I wouldn't necessarily shy away from them. I don't hit it big like some of the boys as all I've got is a bunch of long straight-aways and with work I don't get to ride near as much as I'd like but I'm happy with mine.
Were they easy to install? And has the finish held up? (I've heard that the finish comes off those Chinese mirrors pretty quick.)