The ZAGG Invisible shield is a very important accessory and is used to protect your IPhone 4 screen from scratches and breaking
. If you have seen the product on youtube then you have seen many videos with people dropping heavy items on the phone, placing multiple heavy items on the phone, trying to break the screen with a key as well as many other videos. Scratching the protective cover when on the iphone 4 is pretty damn hard and shouldn't with too much ease. The protective film shouldn't flake back at the sides and should stay on the phone for a good amount of time. The installation of the screen protector shouldn't take too long with around 20 minutes being quoted by most people.
With the installation videos watch away you can't run into issues. ZAGG provide an instructional video for you to watch so that you won't have any issues when installing the shield. However, patience is most likely required and clean hands will aid you. Any dirt, or dirt that are on your hands will end up on the film and thus on your screen. I'm pretty sure no one wants this.
Iphones cost so much money these days is there any way you can't protect your IPhone 4g. If you want extra cover then you should certainly purchase a case for the phone which won't cost that much (around $20 for a good one). This will help with dropping of the phone which from my experience is very common.
In the end, the shield is very worthwhile and I absolutely recommend it to everyone to get for their Iphone 4 as when your screen is scratched it is permanent. So do yourself a favour and buy one of these now.