I'll chip in here just to add another Evertune owner. I absolutely love the device, and would have it standard on all my fixed-bridge guitars if not for the fact that it requires a fairly thick body to install and therefore I won't be seeing one on my favorite S-Series babies anytime soon. The "play" with regards to the sensitivity of bending in Zone 2 is completely up to you; the tradeoff between having generous resistance to pitch instability vs. "I can barely feel it" is yours to decide, and instantly tweakable. It's also pretty damn cool to be able to put on a new set of strings without ANY tuner whatsoever, and have it rock solid even before the strings are broken in.
If you keep an eye on Evertune.com, every so often they have free installation deals where they will install a [EDIT: Evertune] on an existing guitar (or heck, even more commonly - a new guitar) for no more than the cost of the item. They are also a reseller for a number of factory-installed models, it's worth checking out often.