I'd recommend everyone go out and buy an extra tube for it. I dropped mine once (totally my fault), and the tube shattered inside the pedal.
Replacing the tube is quite the ordeal. It takes many hours and precision on the level of performing brain surgery. I'm not even mad at Markbass for that. It actually boosted my self-confidence, showing me that I can perform great feats if I set my mind to it. The whole thing has led me on a journey of self-discovery and fulfilment, teaching me to be more patient and careful.
As for the pedal, it's okay I guess.
My band: Windy City Slaughter (check it out on Facebook, bandcamp, soundcloud, etc. etc.)