As a guitarist, I've seen every "self-tuning" fad come and go and I suspect the new Tronical PowerTune will follow suit. To install the PowerTune, you'll have to replace both your tuners and your bridge with theirs, something I'm not crazy about since that'll definitely alter your tone no matter what they say.
Don't get me wrong, Tronical promises some cool things like finer tuning with their tuners being more accurate than standard tuners. I'd like to do some tests with a strobe tuner before I believe all their claims but even if it lives up to some of their claims it could be the first step in guitars that tune themselves. Now all I need is a guitar that strings itself.