Hi, I've got a set of alluminum Sparco pedals.
I had them on for about a week then took them off as they raise the pedal height making it even more uncomfortable to drive. My pedals have the volume pedal shaped for easy "heel and toeing" but this meant I was catching the breenge control almost every time I braked. They looked superb, but were actually a pain in the arse and quite uncomfortable.
The volume control was a pain in the arse to fit, in fact they all were, but the accelerator especially, and mine have the rubber nipples
BTW, anyone wants them, £10 including postage to the UK.