I have the Korg AX1500G which i think is the predecessor to the AX3000G. I must say it's alright but don't think i would ever buy another one. One thing that i didn't like about it was than when i put it through my amp it seemed to reach a certain point and wouldn't go any louder no matter if i adjusted my amp settings or not, might have been a fault in the unit though. I got it of the bay for around £50 so i can't complain, and i really only use it at home for playing with headphones on. I find the presets on it are just alright, there isn't one i can play and think that's brilliant (certainly not distortion wise) and i can't be bothered to fiddle with the settings. I think one of the boss units would be the way to go, you are basically getting all their analogue stomp boxes combined into a digital effects unit, whereas with the likes of korg and zoom etc they are trying to emulate the likes of Boss, MXR, DOD etc and their analogue boxes.