Incredibly satisfied.During one the surprise heavy snowfalls, I was shoveling snow, and as I was walking in front of my wife's recently purchased car. I slipped, and the shovel flew and went down the front of the windshield leaving several deep scratches almost top-to-bottom on the glass. Several windshield repair companies said the same thing: They didn't want to try to buff/grind it, since it could leave a flat spot on the glass and distort the view. Replacing the windshield would be several hundred dollars.Before I spent that money, I googled to see how others dealt with scratched windshields or glass. That search also showed me some results of what's used on crystal and jewelry as well. Consistent positive results came up for a few products, and I ended up buying toothpaste (What the heck, it was cheap!), Polywatch, and Novus 7100 (the #2 solution was recommended).The toothpaste did not work at all. I'm not sure it made any difference in the scratches. I used a generous amount of 2 "recommended" brands and put some muscle behind it on a clean cotton cloth. Looking at the tiny tube of Polywatch, I figured I'd try that next, since I'd probably run out, then I could compare it to the Novus 7100. I sparingly ran a thin bead of Polywatch along a less deep scratch, then used the microfiber cloth. In about 15 seconds, the scratch was not visible! Shocked, I applied some to a section of a deep scratch. It took about a minute, but again, the scratch went away. Then I went for the deepest scratch. After roughly 90 seconds, the section of the scratch I worked on was _barely_ visible.I ended up working on other scratches, then came back to the deep one. There was more than enough product in the tiny tube to cover all the scratches, since I had to use so little to work on an area. In about 15-20 minutes, I couldn't see any of the original scratches, but it was starting to get dark outside. I windexed the windshield, and I'll take a look tomorrow. I imagine that I'll see something in bright sunlight, but I'll just use what's left in the tube and try again. Even if there's a scratch, it will be dramatically reduced, and not visible without close inspection. I doubt that any driver would notice it if they didn't know it was there originally.This stuff was so easy to use and effective, I never even tried the Novus 7100.Compared to the price and inconvenience of getting a new windshield, this stuff is gold!