do you own a guitar with gforce? Did it ever happen to you?
Three of them, and each time I tried to live with it for a while. The first was an SG. Wouldn't stay in tune.
Second was a Les Paul Traditional. At practice one night, I tried to retune during a guitar lull in the middle of one of our songs. Didn't finish tuning until the rest of the band had finished the song.
Last was on a Les Paul Special that I got last week, and I just took it off this morning. I tuned, and the E and A strings got locked in some sort of software tuning loop, and detuned to the point that they were floppy. It never stopped, I had to manually stop it.
3 for 3. If you use one, it will fail you.
[EDIT, oh yeah, also the "capo mode" never worked correctly for me. Wasn't user error, just wouldn't reliably tune. Also, wait until you have to change a string on stage. Better have 2 guitars.]