I've been looking at these amps for a while now. I decided to pull the trigger, and get the Zombie II. I received it today and hooked it up to a 1x12 cab with a vintage 30 speaker. This little guy is insanely loud. It's a little chuging machine, I still can't believe what's coming out of it. If you're into high gain metal tone this can't be beat at this price.I doubt at 20 watts this would hold up against a powerful drummer, but with a PA and a good mic, it most likely would. I was also impressed with the clean channel, it's not colored in any way by the gain. If you turn up the gain on the clean channel it beefs up your tone instead of having a traditional overdrive sound clip the tone, it's perfect for running pedals. There is quite a bit of beefy low end to this amp, something I personally like.I would suggest adding a pedal EQ to shape it to your liking. I'm really blown away by this little lunch box, I wouldn't hesitate in buying another.Edit 3/14/2025This is not a head phone amp. I blew one of my drivers on a set of Audio Technica ATH-M50x headphones. Not sure if this an impedance issue or overpowering on the headphone out. If you need a quiet headphone practice amp this ain't it. This was made for speaker cabs.