Yeah, The ones in that auction do look good, but like the others said, I'd worry about vibration. I had a pair of cheap after market mirrors on an old bike of mine once. Their soul porpuse was to get by inspection... basically because they did nothing else. They were so loose that the vibrations always knocked them out of alignment.
That would be the only question I'd have for that seller - how tight are they to adjust? The tighter the better.
Personally, I have bar ends on all my bikes. You can actualy see behind you with those.