I've used the 'other' windshield sealing product for decades. I bought it when it was an infomercial special. Once I got it applied right I was amazed at how it improved driving in almost every wet weather situation. Light mist being the one thing these products don't handle well. So I was happy to try the Griot's Garage version when it was offered.Application was easy. One small towel wet with the product applied in a crosshatch pattern on the windows. Wait a few minutes for that coat to dry and apply a second coat. Then buff off with another, clean, towel. Just about the same as the 'other' product except I used to use a wet method of buffing off theirs and Griot's only mentions using a dry towel to remove the haze that forms when you apply this.I must say that the Griot's Garage window sealant buffed off much easier than Rain-X (there, I said it) ever did. I don't know if that's a good or bad thing. Does it buff off so easily because it's leaving less product applied to the window or is it just formulated better? Or was the wet method I used to use just that bad at getting the job done? I really can't say at this point.Fortunately just a day or two after applying this the Florida weather kicked up several hours of serious downpours while I was out. I was even test driving a new Kia in the middle of the storms and really wished I had been back in my car when the rain got heavy.This stuff works. Just as well as Rain-X (I said it again) ever did. Rain water beads up and at speeds over 30mph or so just shoot right the heck off the windshield. At slower speeds they quickly slide down the glass. I usually get one rainy season out of a coating on my car. I'm driving a bit more than I have in the past years so I'm sure this will be put to the test frequently. When it starts to wear off and needs another application I'll come back and update this review.Things I wanted to note:The bottle works differently; lift the cap so the dimple that seals it is lowered inside the cap. I found that no matter what I did product leaked out from around the bottom lip of the cap you lift up to dispense the sealer. I probably wasted a  more product than I used due to this leakage.This product, compared to Rain-X is expensive (yes, I received this for free but I made myself aware of the price to provide a comprehensive review) in fact it's several times more expensive than the old style flip-top Rain-X product that is still available. Griot's clear bottle lets you see easier when you're running low but I can't detect any real difference between the two products, they smell and apply exactly the same. Griot's only benefit was buffing off easier.I'll report back with a longevity update. Perhaps Griot's Garage Glass Sealant will last significantly longer.