I'd like to buy a couple Joyo effects, but I've read numerous reports of switch failures, and some arriving DOA. Big music stores don't carry them (MF, GC, Sweetwater, etc) and there must be a reason. Hassle with customer returns ? Take a look at this video: Furthermore, I prefer effects that accomodate a 9Vdc battery along with the external 9Vdc power supply input. If the external power supply fails, at least I'm confident I can get though a song, and probably the entire gig, with the effect running on battery power.