Generally, this pedal effect has everything I expected. I use it daily when playing the guitar.
As a fan of Kirk Hammett I am completely satisfied with the sound which this effect provides. The effect range is very vast. I got me closer to the sound of Kirk Hammett's solos when playing Metallica songs, although it sounds great also with music by different bands (for instance Black Sabbath or Led Zeppelin).
Another big advantage is full metal body, so you do not need to worry about the durability of the pedal.
On the other hand, in comparison with Dunlop Crybaby CB-535Q, this model lacks boost and Q control. But since this is a signature model, I do not consider it as a major disadvantage.
To sum it up, I really recommend this wah wah pedal.