Members are just trying to source more reasonably priced alternatives. Why pay a ridiculous price to one company when someone can make them for say a third less .... ? Many companies offer or allow alternatives, I can't see why this would be any different.
Godspeed charge £650 for 308GTi discs. It's £700 for Alcon discs from Fish Brothers.
It's a £50 saving. Obviously the theory is that when you replace the discs you only have to buy the disc and not the bell. There should be a saving if you're changing discs second time around.
Genuine discs last around 50,000. I'm not sure about the quality of Godspeed's discs. There isn't many people going to be buying two sets of discs during their R ownership to make it worthwhile. The other issue is Godspeed's discs might not be as good quality.
The other issue is when the car is sold on the next owner won't know where to get the discs to suit the bells. Also there is nothing to say that the source of the replacement discs will carry on 5 years down the line.
It'll also have to be a modification named on the insurance.
Can't see it being a problem myself a disc of metal is a disc of metal, look at the disc options from Mtec for current cars. It's the same as the R's plugs used to be only supplied by Dealer's I seem to remember now from ECP's etc. All good makes the R even more of a performance bargain.
A bit of metal isn't just a bit of metal. There is so many factors why one disc is better than the next. That is why some discs last longer, don't crack or warp. It's all down to the process of manufacture and quality.
As above Godspeed charge £650 for the 308GTi discs and bells. They look cheap compared to the Tarox discs and bells.