I used to have a soul press 2 that used as a vol/wah. It's good. But I couldn't get it to sound like my fav 535Q. So I sold that and bought a used 535Q mini, has a boost switch and all. For my current expression needs for my Stomp, I got an Ampero Press (which is a passive vol/exp pedal). It's sturdy. But only time will tell, as far as it's dependability is concerned. I read in multiple forums and videos (Josh Scott mentions as well) that wah+vol offerings are not as good as wah only and vol only offerings.