I finally got my RS20 calibrated recently. Went with the local Lion AV associate, Chuck Williams and I was quite pleased with the process and results.
I had previously calibrated the RS20 myself with HCFR and a Spyder2. That combo, combined with my inexperience, meant there was room for improvement across the board!
The whole process took about 4.5 hours, in part becuase I followed along every step of the way to learn all that I could, in part because I pressed for a little extra measuring at several steps to understand just how precise it is possible to get by doing the goldilocks "too far, then too little, then just right" approach to several settings, and in part becuase we didn't just do one setting but three:
1) *rec 709 for 2.35:1 films (this was our baseline on my 2.35:1 screen)
2) *rec 709 for 1.85:1 films (I use the zoom method which not only impacted what lense aperture to use but also slightly altered the gray scale)
3) *derivative of #2, but with a color temp setting that approximates the color of white produced by projector bulbs during the b/w era (since I love classic movies)
The images below show the before and after measurements (with the exception of the third dimension which the CIE chart doesn't show, though it too measured as close to spec as the measurements in the CIE chart). *The "before" measurements show what I was able to do on my own.
RGB BEFORE AND AFTER
These are the settings that generated the above "post" results, though you don't see the detailed gamma corrections here. *Note that these are likely NOT transferrable, since I am using a Stewart 2.0 gain screen which is color corrected for film and CRT.