I have a fair gamut of these scopes.
The larger magnification scopes, 3-15 and larger, are only visible in more low light situations. If it is dark enough that you are having a hard time seeing your reticle, you will definitely see the illumination.
The smaller scopes, 5x, 6x, and 8x, are definitely daylight bright. My 1.5-8 and both my 1-8s as well as the new 6x scope don't even require the highest setting for me to clearly see the illuminated reticle while shooting in bright daylight.