Gads, I'm on 3 days after a rather poor IS install, but the tackiness hasn't gone away.
I'll be getting it redone in about... oh, 7 hours - and hopefully a well done install won't have the same issues, but I miss, so much, the screen without a protector.
That said, the trade off of not getting another scratched screen is by and large worth it. We seem to live on the beach with all the damn sand we get in here, and that'll scratch the screen in the blink of an eye.
Also, after trying to take in/out the iPad from the Apple case with the shield on, I can tell you that if you're planning on keeping it in a case (like the apple folio) where you don't plan on removing it, skip the back sleeve.
I can't imagine someone not having, at the least, a silicone sleeve around it...