Wow, this thing sounds great plugged straight to a cab from the tube power stage. I moved into a smaller apt, and decided that I didnt want to deal with my rack when I'll mostly be practicing for the next year without gigs since i've become a student again. I set up my IOD as the head, and praticed tonight. First of all, it maybe 4 watts, but this thing is a really loud for 4 watts! Now i can totally relate to that review that mentions it being loud. I don't know if it would hold up in a loud rock practice, but i can definitely see it holding up fine for acoustic practices with room to spare. Maybe i'll try that out one day by bringing the 1/4" speaker cable. Second of all, it sounds much different. It has waaaaaaaay more lows like this. I know that some people have found the SWR IOD to be 'thin' sounding and lacking those deep lows, and maybe now i have a real taste of why they think that. The lows i get through the direct out, and my Eden 210XST are much deeper and satisfying. And mind you this is flat, since there are no tone controls availible, only the tube gain control, everything else is bypassed/not in the signal chain, and my bass does not have active controls, so this is flat across teh board in terms of settings. This leaves me wondering where these lows go. Something with the design keeps them from getting through the tone control section when the preamp-outs are used. Thats too bad. I've switched back and forth by plugging in my poweramp and trying to compare, and there is a difference, its not astoundingly huge, but its there, and not hard to discern, immediately noticble i'd say. Not to say that the lows are lacking in normal use for me, but the idea that this experience put in my head, is how nicely my cab would sound with a tube head, especially since its pretty sensitive, and probably would get very loud very quickly. Just thought i'd chime in with this, as i think there are still a few of you with the IOD and might take interest in this if you havent tried already. on yeah....and the thing is dead silent when using the power from teh tubes. no noise at all.