Sorry Greg - the second paragraph was more in the direction of "new guitar tech" trying to replace the wheel. Of course it shouldn't make guitars feel different....I do tend to stretch analogies to extremes a lot in order to illustrate points, as opposed to bringing to new ones to the fore!
I guess it have it in my craw that another part of my instrument that I regard as something I feel (tuning up, stretching in and maintaining) is being taken away or reduced. For example, my Explorers are set up for different gauges, differents tunings. I bring strings up to tune and only very rarely do they ever go out of tune by more than a few cents once up to pitch, stretched in and played a little. My Ibanez S1670FM maintains pitch consistently if it's strung and stretched correctly. I can feel when a string is (whether really feeling it, or just confident via experience) stretched in and playing up to standard. I have a personal relationship with my instruments and each one is familiar with it's particular eccentricities and needs. I'd rather not introduce a device which would start to question my familiarity and touch with an instrument by taking tuning etc. into it's own hands....
The battery lasts for two hundred tunings apparently. That would be thirty-fifty sets of strings for me on average. I would only trust such a device to bring strings near to pitch when restringing, and then i'd maintain the instrument on a personal level myself, fine-tuning and all. Perhaps a retuning instrument would be useful as a one-off, but I can't see these changing the way people tune and maintain their instruments. Waverley's ain't going out of the door yet, and they're low-tech!!
Maybe Gibbon should invest some money by integrating some PG technology!