I made the switch to iPhone a few months ago and I pretty much love it, in spite of a few annoyances. As a phone, it's a great little balancing of features and quality and all in all, I'm a fan. Probably for life. We'll see.
I got the 4 for free, since the 5 was out, and I bought the OtterBox Commuter case, which I have no complaints about. It's a great case with a slim profile and I drop my phone...a lot.... Since the Commuter doesn't come with the built-in screen that other OtterBoxes do, I got the Invisible Shield screen protector. It's supposed to be all high-end and fantastical and whatnot, but I hated it. Here's why:
Ew gross! The hole for the home button collected all sorts of grime, which stuck to the underside and became a seriously annoying (and nasty) eyesore. I put it up with it for awhile, but it's not cool.
Stuck in on there, and voila! Protection just where I need it, and no more gunk.