I talked to a DWIN rep who was demoing the Transvision at a local A/V shop this past Thursday and asked him that very question. He said that a six segment (RGBRGB) color wheel would most likely decrease the amount of time and distance any given color was away from intersecting with the light path and therefore reduce the latency that contributes to producing the effect. It sounded reasonable, but I don't think it takes into account all the variables that produce the effect (i.e. - brightness, the accuracy of the DMD in regards to reflection timing and synchronization with each color element, etc...). I remember reading on another forum that the color wheel can sometimes get misaligned, either through usage or because of a manufacturing defect, and cause further problems with the rainbow effect.