Originally Posted by MenZerna

It compares favorably - because it's the same thing! Although I don't think Mequiar's says officially that they are the same, the general concensus is that they are. The gallon jug of D156 will end up costing a lot less, but Ultimate Quick Wax is a great pick-up if you're at Walmart or similar.

In fact, all of the consumer Mequiar's "Ultimate" products are great, especially Ultimate Compound.