I have to admit, I still have an irrational paranoia of electronic instruments killing rock music (developed long before Guitar Hero, even). At first these instruments seemed pretty cool. That was until I watched the walk-through videos.
Here are the cons for me: They are so flexible that they’d probably take as much effort to really learn as any instrument, you have to have software running to use them, and they are expensive! I’ll take the less evolved Gibson Robot, please. 
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