I tried to put one on but couldn't get rid of all the bubbles so took it off again. I clean the screen every week or so with a damp cloth and a little washing-up liquid and that brings it up as good as new.
Is a screen protector necessary at all with the modern tough glass?
That's a question with a different answer for everyone. Do you really need to use a seat belt? Do you really need medical insurance? Should you install anti-virus?
With the advances in screen glasses, there is a lot less chance of getting scratches. If you are like me, my electronic gadgets are usually in one of my pockets and I'm eventually going to rub it with a key, coin or pen. I'm also pretty good at dropping things which is why I use cases.
Bottom line is you don't really need one, but some day you might wish you had one.
Bubbles can be avoided with patience. Before installing your screen protector, make sure the screen is clean. Peel about an inch of the backing and line up the screen protector. Using a credit card, slowly scrape the protector as you peel the backing.
The trick is to go slow and keep scraping. Don't give air bubbles a chance to form.
You'll get better every time you install a new screen protector.