Both of the above have mentioned the important stuff. all I have to say is that I had a guitar with a floyed once and almost broke the guitar in half because of it. True enough, once it's in tune, it's there to stay for a good while. But, heaven help you if you want to change the tuning a bit. even just a half a step is a major ordeal, unless you really know what you're doing with a Floyed. Personally, I will never touch another guitar with a Floyed. Some people love them, but I absolutely hate them. But, then again, I also can't stand a regulay trem bridge. To sum my complaining into a final statement. Your guitarist with the Floyed will have to go through a good bit of trouble to lower the tunning a whole or even a half step down.