I hadn't heard that, either way, myself, I'm a conesure of a hand made, well thought out, highly evolved and developed product time tested to endure, with the mindset combined from the end users input, intuitiveness, along side of natural art ability to be decisive in such a manner that creates nothing less then a masterpiece of technology and usability.I get left with the impression that the "sweet spot" is perhaps a matter of individual taste. Obviously some people have found 5v preferable and mention this when they prefer the Prodigy to current GGs. I haven't tried 5v myself only 6v and 3.5v, and 3.7v but I would like to.
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That , is why I chose the GG.