The features on this wah pedal made want to have one immediately. I used to play Morley wah pedals because of their convenient switch (i.e. step on it and go), but I wasn't quite happy with the sound. With the MXR MC-404 I can actually get the "normal" wah sound which is, at least to my ears, still the best for clean sounds AND I can also have a wah sound that works really well with hi-gain sounds. Since I am using the higain channel on my amp most of the time, I really dig the red setting of the wah. Additionally, the boost switch is another great feature on this pedal (mine is usually on to deliver some extra kick!). I have been playing 20+ gigs with this pedal now and I am very happy with the way it holds up, can't complain about the quality.
The only thing that is bothering me is that is hard to turn off/on the mini switches on the lefthand side when the pedal is on a pedal board. This takes away the versatility in live situations.