By design the yellow rear sight is dimmer than the front yellow. in daylight the fiber optics are great. low light the yellow is a bit to dull. the darker it is the better the sights work. I use this for a carry gun and night use. they are very good. but when I read the rear was less luminus i thought ok it's that way by design. So why were people complaining. Now i know. it is just a little to subdued for me. Since it is a different color than the front maybe it could be a little brighter. After all the contrast od yellow to green will prevent green overlap. I have the TFO greens on other guns. if i had it to do over I would probably stick to the green and no yellow. I won't change what I have for now because it does work.
Pros: Better than stock sights. Fair price
Cons: Yellow rear could be brighter.
This review was written in the old system and had content requirements that are different than reviews written today.