While I would prefer to use the phone without any type of shield at all it offers some benefits that I see every day. I work in a construction trade and am currently running a bead blast machine in the shop. There are millions of tiny particles flying around and I'd hate to set my phone on my toolbox or somewhere and end up scratching it. Another benefit for me is in regards to the sticky feel you don't like. While it isn't as smooth as it is without the shield, when I drive my truck I set my phone on the middle console and the stickiness of the shield prevents it from sliding around when driving. It's nice to just set it there when I get in and not worry about it ending up at my feet when some idiot pulls out in front of me. So for me, there are definitely some benefits that out weight the drawbacks.
As for putting it on, it took about 15 minutes and some patience. I used a bowl of soapy water to apply the skin which came with a little card to squeegy it out. After about an hour I checked it and squeegied out a little more and it turned out perfect. For the back, after applying it and squeeging out as much as I could I used a hair dryer to ake the skin more pliable and conform to the edges better. It wasn't too bad, just take your time. I did take the back off so it was easier to move around with out worrying about the front or any water getting inside it.
Victor