I'm really pleased with this pedal, it's actually the first cry baby I've owned and I was surprised how heavy (in weight) it was, although can't comment if they all weigh the same! Sound - there is a really clear sweep on this pedal, I like the sound better going into a gain pedal or amp, no quiet spots! The bright blue led is useful when playing live, although I've gotten some great tones out of it by having the wah on, and just set in one position.
I think the Slash version is voiced for a darker tone, and to my ears this works, I've had other brand wahs before that have just been too trebly, I'd recommend this wah.