I just received a second hand U5 from talkbasses own "couvy" (that's right mate, I received it. sorry I bugged you so much... ) and I have a gig tonight at which I am going to try it out. I'll tell you all my own personal opinion after the gig! I am trying so hard not to go in with high expectations, but I can' help it. I already listened to my bass through it with headphones and was mightily impressed, especially with the low pass filter... very nifty indeed. One question though, and it may seem a little silly, but due to the fact I am running it on 230 V, I should also change the fuse to a 0.5 A as opposed to the 1 A fuse already in there... I'm guessing it will be ok unless something goes wrong tonight . Anyway, i'll let y'all know how it goes... Just so you know, I am pairing it up with the rest of my gigging amp, which is an Epifani 410UL/QSC PL218 combination. Should be rather tasty.