I installed my Ibanez Backstop today. The RGT220A had a route in the trem cav that allowed the Backstop to be installed without touching the springs and sitting/touching the Edge Pro just fine. I had my doubts on the "in-tune" string bending part but here is how that works.
If you bend one step up it keeps all other strings in tune. Go much further than that and the other strings will start to go flat but who really does across the neck bends playing two strings
. Do not ask me how it does it considering that it does not "pull" on the trem as a Hipshot Tremsetter does.
Flutter, it does pretty much put an end to flutter. You can pretty accuratly mimic flutter manually and make it sound good. I do not use flutter much and so I am not worried about it. If I really feel the need to flutter, I can use my 89 RG550DY for that.
Return to Pitch, yep it works just as stated. Nuff said on that.
Tuning is a breeze as the Backstop does return the Trem to the same exact spot every time. First few times I went wammy nuts trying it out it did not. I was like “CRAP” it does not work. I figure the Backstop springs needed time to settle in to their “posistion”. Last few wammy sessions it came back perfect ptich.
As with many Trem accessory products like the Tremol-No, HipShot Tremsetter, ESP Arming Aduster, and ect sustain is increased slightly. I suppose this is because more string energy is going to the wood rather than being asorbed by the trem springs.
If requested I can take pics of it on the Trem cavity but that will have to happen later as my camera is in the wifes van and she is out shoping.