Other than the lack of a decent sustain block and the ZPS bar stop needing a mod to make it 'perfect' the edge zero 2 trem is pretty good.
what I do not like about it is setting the intonation. you need an e-Jack to do it, but even so, that tool is not perfect for the job, and there is no screw on the rear to push/pull the saddles like there is on other ibanez trems.
When it is setup however, it is rock solid and doesn't lose tune. The ZPS is very good, and those who object to it are usually ignorant of the physics involved, and why it is there, and why it makes sense to be there.
I posted in another thread about the sustain block mod and there is a youtube video on the ZPS bar stop modification, which basically involves a dremel and clearing out the v shaped channel to make it hemispheric - so the ZPS bar actually seats on the zero point itself, instead of in the 'V' wedge.
Ibanez need to step up their game on the ZPS subcomponent manufacturing quality - and should be using metal instead of injection molded plastic for the stop bar retainers.
Hopefully someone with a CNC can machine up some brass ZPS stop bar retainers, and then the thing would ring out even more.
The bridge setup when done in accordance with the ibanez documentation is dead easy and WORKS. I honestly wonder how many ignore factory instructions - including the guy who originally setup my missus RG350 - who allegedly is a great 'setup guy' - but in my own experience, knows very little about how to setup a trem bridge in an ibanez.
I fixed it by doing what anyone without detailed knowledge about a system shoud do - that is RTFM. (read the f* manual)
Sure, it took me 3 hours and cost me an intonation tool (which isn't perfect for the job, but there isn't anything else that works) but for $50 and a few hours, the missus has a rockin' RG that will not go out of tune. It's dead stable and has been that way since I set it up.
I will concede that the sustain block is too small and made of junk cast zinc alloy - to which there are better options out there in CNC-land, and they do make a difference. Hantug and KGS I think are the two most prevalent. I am not sure if FU-Tone make an edge zero version.
Anyway, that's some food for thought. Don't ditch the trem unless you are really dissatisfied with the sound. Everything else is simply down to proper setup - and it's not difficult - Ibanez have made it simple enough for anyone to follow the setup instructions.
Ibanez website contains the edge zero 2 tremolo pdf in their manuals section.