Re: Evertune Bridges?
I briefly had the ESP LTD EC1000 that came stock with one. The 1000 series LTDs that come with them stock are the most cost-efficient way to get into the Evertune thing.
The Evertune performed as advertised. It never, ever went out of tune, no matter how violent the bend or how much temperature changed in the room.
What I didn't like was the slight decrease in sensitivity mentioned above. In order to bend strings - since you can set the Evertune so that pitch doesn't change even if you bend strings - you have to set things up at the precise point between "can't change pitch at all" and "Evertune is off, guitar can go out of tune like a normal guitar". Finding that point can be fiddly, and for a player like me who's way into vibrato and microtonal bends, it was frustrating. I never found the mythical point where bending acted 100% like a conventional guitar.
What was also oddly disconcerting was how in tune the guitar was, intonation-wise. What I mean is that probably most of us have gotten used to the sound of electric guitar as a slightly out-of-tune instrument in terms of intonation, since perfect intonation is impossible on a conventionally made guitar. I don't know if Evertune is actually a true temperament system; if not, it's much closer to one than a conventional guitar. It was strange playing all over the fretboard and having unusual/wide interval chords be in tune completely and precisely. You would think that's not a problem, but I felt like I was playing a piano, not a guitar. The whole vibe changed.
I can see Evertune being great for certain applications, like tracking rhythm guitars in the studio or some kinds of live rhythm playing (power chords, stuff with not much nuance). Psychologically it's powerful never to worry about falling out of tune, but it's also psychologically detrimental to feel like one has condoms on one's fingers.
A better solution for me personally would be a blocked (or fixed) double-locking bridge. I'm used to ye olde hex wrenches with Floyd saddles and nuts, and if the bridge is fixed/blocked, then it's simple to lock stuff down. This method won't yield "never gets out of tune" like Evertune, but it yields "stays in tune 90 or 95% of the time", which is good enough for me.