I've been hunting with the rs1.2 the last several days which have been rainy/overcast. Hunting until 30 minutes after sunset. Well designed reticle and in most cases the illumination isn't needed. On dark backgrounds (cedar trees on field edge) the outer bars can get lost and lose the ability to subtend. In those cases the lowest illum setting is very nice.
That said, at the darkest point of legal hunting (in my location), with illum set on the lowest level, it appears that more of the reticle than just the center dot is illuminated. The center dot is the brightest but it seems that there is a touch of illum on at least the numbers. I spent a good bit of time watching a group of does, a few with last years young still with them, through the scope the last several evenings and the illum (even at the lowest setting) does make the image a tougher to see detail in the dark. At less than the darkest point, I can't see the illum from the numbers, but at the darkest point I can...this does cause some image wash. It's still usable, but it appears more than just the dot is illuminated. At higher illum settings, there is a difference between the level of the dot, the numbers, and the inner reticle. I'm not sure if this same differential remains at all settings or if it changes. It's still usable, but it's not perfect...at least on the one I'm using.
It's my preference to avoid using illumination if I can. There's very few cases where it won't cause some loss of image quality. The greater the area of illumination and the brighter the illumination, the greater the loss of image quality. Mavin did it well in this scope but it's not perfect. It does work to identify the "dot" but at least the numbers...or a shine from them...can be see on mine. In the worst conditions I'll use it if I can't subtend.
I should note the majority of time above was from 6x-8x.