If you're a low-mid level player, I think it's actually not that bad for $80. I even learned how to do a lot of upper level songs on the tiny thing (and adjusting from KOC to arcade wasn't really that hard when I actually got to play on one). Adjusting from arcade to KOC is hard though...if you're used to playing on the arcade, don't bother, you'll hate the KOC. Also, if you're already playing upper level songs on the arcade, then yes, the KOC will suck.
But I attribute most of my DM learning from a KOC.
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