Failed for sure, i prefer not to speculate why they thought it would be useful in any Prestige axe or if it was experimental. I think Ibanez Japan really believes what i'd term hubris.
The EZ was designed to get around paying royalties to FR. Ibanez screwed that up, got litigated anyways and the EZ1 had to be pulled as a result. That created problems of course as the routes were different. Some of the body tops are embarrassing. Typical Ibanez japan clusterfvk not listening to what customers want.
The way I look at it with your decision is why not pay $100-$200 more for an RG with real Edge. These are so cheap in the USA in great condition always available.
When you don't know you probably shouldn't answer.
EZ1 is on the Prestige and had the intonation bolt in the baseplate.
EZ2 is the same trem minus the intonation bolt with dumbed down base and saddles without the tabs that were needed for the bolt.
The trem was Japans baby, they still love that trem, it's their design. Functionally it feel better than a Lo Pro, has positive torque control on the arm, and has the hardest knife edges and studs [locking] they ever used on a trem.
Drawbacks, it was made in China, the rout is not compatible with anything else [stud spacing wider], the fine tuners were tough to grip to turn, and the biggest problem is they dropped the steel saddle lockdown plate so if/when you strip the threads on one it has to be Helicoiled.
The lawsuit was about the sprung ZPS unit and had nothing to do with the trem.
MANY people did and still love the EZ and prefer it over Edge/Lo Pro, I'm not in that camp but it's easy to see why.