It's been noted that the 4x & 5x RGBRGB color wheels diminish the rainbow effect for the majority. Those folks who are sensitive to rainbows will be affected to some degree regardless. I guess you could compare it to color blindness...you either are or are not. The majority of folks are not.
Relative to my 50+ guests who have watched multiple movies on my Piano...
Epson: 5040UB | Elite: 115" Fixed Frame CinemaScope (2.35:1) | Onkyo: TX-NR636 (5.2.2) | Klipsch: RF-7 II's, RC-64 II, RS-62 II, RB-61 II MICCA: M-8C (Atmos) x 6 | SVS: PB16-Ultra x 2 | Philips: BDP7501, Panasonic: DMP UB900, Oppo: UDP-203