I have a Shimano DH-3N72 hub ($100) and a Lumotec IQ Cyo with the standlight ($100). It is an exceedingly bright light and flicker is not an issue. I guess when I am coming to a stop, I might have noticed a slight flicker but, believe me, it is no big deal. Mine has a switch which is important to me because I don't want the light when I don't need it. Plus there is a slight amount of drag associated with the hub- turning the light off reduces the drag. I love the set up.

My understanding is the cadillac of dynohubs is SON, but they are expensive. Apparently, the main benefit of the SON is reduced drag. I have never experienced a SON, so at this point I am completely happy with my $100 Shimano.