I did a 50/50 6 months ago testing black hole out on a ford taurus with 250K on it that was a DD of a friend that he pretty much destroyed... It was black.
The Black hole side was much darker and deeper even after LSP application and it has had a noticable effect even today when you see the car dirty you can see a darker left side... gives the effect of a ridge line in the hood that is not there when seen at the right angle.
I can say it is outside all the time but not washed regularly.
I was impressed that the effects lasted so long...
Oh and the hood shot in my avatar was after SSR 2.5, SSR1, Blackhole, then max wax (i think)
Just my experience with the product