I bought "The Key" for my Ibanez RG760 (this tool works only for Floyd Rose bridges) to try to set correctly its intonation. I watched a couple of youtube videos (before buying it) on how to use it and it really seemed like a piece of cake. Well it wasn't! Although it's easy to mount it on the saddle, it becomes really stiff when mounted and thus it's difficult to rotate it. At the end I managed to improve the intonation of my guitar (still not perfect) but it took me a lot more than the 5 minutes that some guys advertised on youtube. Maybe it was due to my inexperience. Anyway, I think this tool is overall useful since setting up the intonation of a Floyd Rose is simple impossible without it. Without it, it would take two people, one holding the saddle in its place after unscrewing it and another to adjust the tension.
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