The first time I used Z-PC on my Mustang, I didn't notice a huge result. It didn't seem to do much more than Z5 does for the car. Today, I detailed my dad's 03 Jeep Grand Cherokee. I was supposed to just "wash" it, but the paint had alot of tar and road grime on it, no wax, and a big long scratch in one side of the car. So I went to work making it look new again. Claybar did an awesome job getting the tar and stuff off, but I still had the scratch left. Z-PC took it out with minimal effort. I was truly amazed that a product could take out a scratch as bad as this one was with minimal effort. Z-PC won't make a difference for those of us who religiously wash and polish our cars, but if you run a detail business and need to clean up a customer's car that hasn't been well cared for, or pick up a used vehicle with some paint damage, it's a great investment. Finished that one up with a coat of Z2... got some nice pop from the detail. Pics of the Jeep later when my digital camera batteries recharge. I also did my Mom's G35 with Z5 and Z2... I was even more amazed at what Zaino did on this car than the Jeep... the silver was looking pretty dull, now it looks incredibly wet.