There's no reason to replace your K3 with a K4. The older model works just fine.
I made the mistake of giving away my K3 a few days before the K4 launched. It looks like I might end up buying a refurbed K3 to replace it.
The K4 is nice, but it's also uunderpowered. It can't play all the games due to hardware limitations (RAM and keyboard).
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