I think it's really hard for under-eye roll filler to look truly natural. Now that it's been over 6 years, it has become much more natural, but the filler is still there, and it has a slightly translucent look, I guess
Anyway, for those who really, really have no under-eye rolls and want to get it done, I think it's best to use only a small amount and avoid being greedy as much as possible.
And it hurts a lot