Unreliable, or so I've heard/seen.
You can see that wire in the picture. It apparently snaps and is a bit of a bitch to fix. : /
Though they have a massive sweep.
I still think the Foxx wah/fuzz/vol is the coolest and best sounding wah in production right now. I would say the Snarling Dogs Mold Spore is cooler, but they don't make it anymore. 😐