I tried the Black Magic liquid wax based on CR's recommendation. Their rating of "Good" on Ease Of Use was a bit optimistic in my opinion. The stuff doesn't dry. Ever.
(I read some reviews later and saw where some guy left a test patch for a week and it still was smeary and greasy.)
Anyway, the stuff was a cast iron Hillary to wipe off. Smeared a whole lot and took more towels than normal to remove from my itty-bitty car. (07 Honda Fit)
It looks okay, probably better than some of the other OTC waxes I've used, but nothing stunning. The greasy consistency of the wax -did- make it less prone to leaving lots of residue in emblems and seams. Granted, my car is silver so it's not the best finish to showcase a wax. I can't say anything about durability, since it's only been two weeks.
I think that my opinion of it is that if Black Magic is CR's best wax, I'd sure hate to see their worst.