I have a Nikon illuminated scope, and I'm not really impressed with the optics. They are noticeably poorer than the ones on the non-illuminated models. That said, the illumination works perfectly, and the scope is really designed for close ranges. I'm ambivalent on the issue.
One thing. If you do get an illuminated scope, buy one with both red and green illumination. If you use a red light (legal where I live), the red reticule will wash out; the green does not.