I've had my Otterbox for a while now, and I will get right down to it, I hate it. Total waste of money.
I hate the front left edge of it, it doesn't lay flush with the phone and has a large gap in it.
The rubber is a great addition, but it collects "gunk" like you wouldn't believe.
At first I hated the carved edge of the front piece (so you can get your thumbs to the top row comfortably) but I don't notice it anymore
Every time I accidentally drop my phone the entire thing comes apart, and not only that but somehow my battery case comes off with it. After about the third time of dropping the phone I noticed one of the clips on the front right side snapped off. Well when I read reviews on this thing everyone said it was hard to get on and really hard to get off, which is good, you don't want it just falling off.....well it kinda does.
But it is better than the really cheap cases I always buy for my phones off ebay, the basic ones for like 2-3 $
Oh but I had no problem with the screen protector, you just need a micro fiber cloth that covers the entire screen until your ready to place the plastic on, and I take it a step further and use my Dust Remover (air can) and keep blowing any dust particles that may land. the annoying part with them is getting the last piece off, cuz you have to peel it back while the screen protector is trying to attach to the corner, and sometimes it wants to come off, lol, annoying.
It's all the problems with my cases for slider phones that make me wish I could just deal with a touch only phone, their cases are so much easier, they just snap together around the phone and barely ever come off, and they have the Otterbox Defender (for the iPhone) which is a beast.