I've had a reasonably long history with this company's products. I first bought a Skinomi for the first Droid Incredible, screen only. I was actually surprised at how well the screen was protected and how invisible the protector was. You really can scratch these things up as much as you want with keys (I never tried knives...) and the marks would go away. I then purchased a full-body protector for a 4th Generation iPod touch. I've had the device for two years, and the polished metal back still looks perfect. My brother's iPod, which he's had for 6 months less than I've had mine, is scratched up slightly in the back, and he had his in a leather case (it was became a little loose-fitting, so it moved around in the case a bit over time). I got this full-body skin for my iPhone because I really liked the protection (and piece-of-mind) the protector gives me. I also bought a screen protector for my iPad 3, but I was less happy with it for something that size, and have since removed it (you can see my review on the product page).ProblemsIf you're on the fence on whether or not to get this, there are some issues you should be aware of. First, the screen isn't perfectly, 100% transparent and it's quite easy to convince yourself that it's not perfect enough. You will notice it if you're looking for it, and it becomes even more obvious in really bright conditions. It's more transparent than most other screen protectors, though, and I think it's a fair trade-off for protecting the screen. When I'm actually using my phone and not just staring at it, I do sometimes forget it's there. Second, the screen holds oils and dust much more noticeably than the glass does and therefore requires more cleaning, but it also cleans a little easier too (I usually wipe it off with my shirt or a microfiber cloth if I'm at home). This should be especially noted with white iPhones. I have a white iPhone, and I installed all my previous Skinomis on black devices. Lint from my pockets collects at the edges of the protector, which I wouldn't have noticed if my device was black. It's a small amount, but it's worth noting. Third, it feels plastic-y. If the texture of the iPhone will make checking your mail and playing Angry Birds that much more enjoyable, then, my friend, perhaps this isn't for you. It also has a different feel when playing games, which I mostly noticed when playing Tetris (that being said, the protector doesn't affect the responsiveness of the touch screen at all).InstallationBy now I've gotten pretty good at installing these. Every time, though, is a little daunting-- you never really get used to the idea of placing dripping-wet film onto your expensive toys. What I do is I have a few paper towels on hand while I'm applying the skin. Clean the screen off as well as you can before starting, then do a quick final wipe before you apply -- I promise that you will definitely notice that one piece of dust that's trapped underneath and it will bother you every day. Apply the spray very liberally, but don't go crazy. I applied these on my parents' phones too and usually use up half the bottle for screen protectors and 75% for full-body protectors. The paper towels are for that-- whenever some of the liquid drips off as you're squeegeeing it out, use the paper towel to soak it up so the liquid doesn't creep down into the circuitry. Also catch any liquid that might fall into the speaker holes or buttons. I've never actually damaged a device while installing these, but it's always better to be overly-safe. I also use a blow-dryer to have it set faster, but it's optional. Once you're done, your screen will look terrible and if it's your first time you'll regret putting it on at all. The bubbles and streaks actually do disappear over time. Give it a day or two and it'll look decent. Give it a week and it should look perfect.Overall, I'm happy with Skinomi. I have had a good track record with them, except for the iPad one. I will probably continue to buy them for handheld devices, but not tablets. There are notable drawbacks, but none of them are significant enough for me to remove a star. But I understand why some people would.