This is the first compound I've ever used on my car and it has done a pretty good job, I must say. I have a 2007 Mazda3 4-door in Galaxy Grey, which has mostly been repainted due to 2 accidents and 1 mishap on the interstate which involved some sort of debris in the road that caused $2,500 in damage, all of which was just paint and a damaged headlight and mirror cover. Anyway, my car just has the basic swirl marks from washing, nothing too crazy. The roof of my car had some water spots and cat scratch marks and this compound seemed to greatly diminish the appearance of these flaws. I've been applying the compound by hand since I don't have an orbital, so I imagine an orbital would produce more results. But once I applied wax after the fact, it came off so smoothly than ever before, so I could tell something worked. Also, my front bumper was peppered with white marks from driving the interstate daily and had some other scratches from when a huge chunk of tire hit my car. I concentrated the compound in that area, used a lot of elbow grease, and I swear, my bumper pretty much looks almost new. It just looks so much cleaner now. I didn't purchase my bottle of Ultimate Compound from Amazon, simply because I wanted to get my hands on it a lot faster, but for 10 bucks, it's worth it. And if you're like me and try to keep your car looking its best, this will definitely help. I have an arsenal of waxes, clay bars and spray lubricants and I now have this compound to make my car looks that much better. I will definitely purchase this in the future.I gave it 4 out of 5 stars because the compound didn't seem to have much effect on the hood with light swirl marks. Maybe I just didn't put enough time into it, but I'm sure I'll go back to that area and if the results change, I'll update my review.Update: 7/3/12 My car paid a visit to Mazda service for a couple new door handles and the service writer complimented the shine on the car. I can definitely tell this compound has added way more depth to the paint's gloss... even though I've thoroughly clay-barred the car and waxed it previously. The compound is takes the shine and gloss to an insane level.