Re: Double pedal with a smooth surface?
I tried the Speed Cobra and liked it - but liked the Yamaha better, and that's what I went with.
The DW9000 pedal doesn't really look smooth at a glance. But I think it's because of the slotted heel pad. The actual pedal part is pretty smooth and my foot moves easily on it.
For heavily modifying a pedal, like taking a grinder or sander to it - I'd only do it with something used.