I'd like to hear the films as they were presented when first released. There was no magnetic stereo print offered to exhibitors on THIS ISLAND EARTH so Perspecta is the way to go.
Don't let some ignorant internet discussions bashing Perspecta discourage you from the process. As I mentioned...
No, I don't believe any have.
In the 1990's, the co-creator of Perspecta (Bob Eberenz) and I met with archival reps at Paramount, Universal and WB with an offer to restore their Perspecta tracks for future releases.
Sadly, none were interested.
Chace did create some kind of Perspecta decoder...
If they do release THIS ISLAND EARTH, one element that is nearly as important as the correct aspect ratio is the original three channel Perspecta stereo track.
I used to have a 35mm Perspeca print and when heard through a restored 1954 integrator, the sound was incredible! Not only was the...