I did a cal on an RS67 with ISF Cal 5. Unfortunately, it was buggy and ended up not being any better than the user controls.
I did a custom gamma with the software, 16 point. I followed the instructions, which I am familiar with having used previous versions of the ISF and THX SW on older JVCs. It worked fairly well until I disconnected and either a) cycled inputs b) changed scan rates or c) cycled pic modes, after which the custom gamma was “forgotten” and the measurements were as if I had not done the 16 pt. The CMS and all other controls worked fine, but those are available in the normal user modes.