Just looking round on ebay and came across this, would you really want to put your life in the hands of a £18 brake disk that looks like a f*ckin doyley!
Yeah I think when it comes to brakes, unless you have access to some very expensive machinery and can do it yerself, you'd be well advised to buy a reputable brand. Even if its true when fitted, who's to say it won't warp as soon as you put some heat through it.
i recently brought brand new discs from him and they fitted just fine to my 1994 cb400 sf. got all three discs for about £140 including postage - that was a pretty massive saving against the prices of £350 plus for the three i was getting quoted over here! they are wavy discs but ive done a few hundred miles on them so far and am pleased with the results so far...
Maybe they're OK after all? Not sure I'd trust them myself though...