Shield Apple

Will the Zagg Invisible shield ruin my iPhone?
Lately I have heard that the Zagg Invisible Shield makes you iPhone/iPod shinier, I was just wondering if this was a bad thing. Also, if you take off the Invisible Shield, will the shininess go away? And also, one more thing, can the Apple store or some other store put it on for me? Thanks in advance!!
I have it on my phone and it’s fine. Haven’t tried to remove it. Best buy installed it for $8.
How To Install Apple iPad Invisible Shield