| The real key to brake performance is the swept area of the braking pads. Yes bigger pads would give a better brake, but one problem, under heavy use is the heat. This shows it's head as fade and one of the contributors to this is the gases created between the braking surfaces. These can create a sort of "aquaplaning" of the pad surface, between it and the disc face.
Drilled discs, slotted discs and Waveys, all use the holes etc. to dispel these gases. Another thing these discs do is to clean the pad faces to maintain clean friction material is always present.
Disc wear shouldn't be any worse, but you'll certainly see a reduction in pad life, mainly due to the "cleaning" effect.
The Waveys produced by Braking are about £176 each. These are the ones on Tims bike and the ones Rushjob has. Also available with Carbon centres (missed those Tim!!)
There is a new kiddie on the block in the shape of Galfer. These are really good quality to and come, initially as a kit (2 x discs and pads) for £387.
As Andy said, stay away from the cheap stuff. Brakes must never be a compromise, and with Waveys, stick with the boys that have been doing it for a while and know what they are doing.  | 
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