yes. Can it be used for aiming with the naked eye in broad daylight at 100 yards? IMO, It depends on the background... and your individual eyesight.
At dusk, dawn or in overcast on the other hand... it can be seen very clearly well
beyond 100 yds.
I don't own one... my daughter does. I'm trying to convince her that a Viridian X5L ECR would make for a swell Christmas present.