As discussed with Ole some time ago, one very important point is about the tuner: unless being very close to the screen, it is pretty hard to tune the guitar. In concert, having your nose glued to the screen between songs is not classy! Unfortunately, I encounter this problem with my guitar going out of tune easily.
Ole suggested changing tuner’s color when the string is well-tuned: this should both be efficient and perhaps easier to implement. I’m already dreaming of it !