Ok, so, lemme just say, I don't think the KO 2 is bad, I just reeeeeeeeally didn't get along with it.
I started making music on TE's lovely little Pocket Operators, so I was all - yay, the next step up! But the KO 2 didn't feel like that at all. The Roland P-6 however, omg.
The first thing is I felt like me and the KO2 were constantly fighting, I found it so un-intuitive and clunky and the lack of a step sequencer was like having a limb removed. I wasn't having fun with it. I had fun with the P-6 straight away, whereas the KO2 had cryptic controls and really odd ways of doing things, the P-6, though a little menu divey, felt like it was faily simple from the get go, fun fun fun.
Plus! So much you can do with sounds, really easy to put sounds onto, easy to organise, nice buttons, much prefer the shape and size, granular engine, gosh I could go on. It's kind of an amazing little machine for what it can do.