I've been using this product for a week now and I love it. I originally bought this to reduce the size of "things" in my bag for everyday use. Second, but not least, I bought this to minimize and/or eliminate my keys scratching everything in a bag. It's such a simple thing, but it means so much. My bag no longer jingles or makes noises, nor do the prongs of my keys tear everything in my bag. I would definitely buy this product again. I think the leather version makes it a little lighter and softer for things in your pocket, although you still have metal edges from your keys and screws holding it together. That being said, if you get it right, the exposed metal won't be the teeth of the key. The leather look also makes it look a bit more elegant. I also have the black compact version and it looks good too, although I think the leather version will only get better looking as it ages.
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