i have indeed used it quite a few times at work. it even comes with a handy dandy "chipstik" to help cover up some of the deeper scratches. although i can't really attest as to how long this wax lasts, it sure does look damn good when you finish it. color cure black wax by turtle wax is good stuff for black cars. let me know if i can be of any more assistance.
Recently I picked up (at a $1.00 store) a container of Silver/Gray color Turtle Wax. It applies easily and appears to disguise light surface scratches and abrasions. I say "disguise" because if you look at the scratch at a sharp angle clearly it's still there. It's not bad for what it is at least on metallic silver.
When I entered my bike at shows I'd cover the "swirl marks/scratches" with ordinary furniture polish using an old white cotton sock. Just spray it on and wipe off, you won't break a sweat and the results are amazing. Just be sure to use clean cloths.
the reason it "covers" up the scratches is because it adds reflections to the panel so you cant clearly focus on the scratches. Cheap trick, and lame, if you care that much about scratches either get it detailed or polish them out yourself, THEN wax for the best results.