I was curious about the KPA, so I did what I always do when something new comes out, based on web clips it sounded pretty decent, so I bought it and owned it for 6 months, it didn't work out for me, it didn't have some effects I needed(Pitch etc) kept hoping the new version of Firmware would get rid of some audio problems, which according to KPA weren't problems which made me think they probably will never fix it, besides for my needs the AXE II was much better, so I gave up and sold it (@ a $500.00 loss!!,) I'm sure i could have gotten a little more $, but I just wanted to get rid of it while everything worked, LED's etc, it just set in my studio unused for the most part, never even took it to a gig, except a few times for sound check to hear it thru the PA. It was very easy to use, and did have a few things I liked, but for me the AXE II is a complete system that I can get everything I need, and it sounds great! I had over 2600 profiles on the KPA at one time, and honestly I didn't really enjoy playing it, I'm not sure why, they kind of sounded a bit flat, even dough they sounded like the amps profiled, the sounds didn't seem alive.. hard to explain, just not very enjoyable to play for me. Perhaps one day if they fix the audio issues, and make a rack version I'll try one again..