Picked up this case a day after I got my phone, (had it about a week). The defender case is a very good investment. It definitely does its job. I've dropped my phone twice, getting out of my truck with the phone sitting in my lap, the phone took a 4 to 5 foot drop face down. The case has a couple of minor dings in it, but my phone remains pristine.
I did not put another screen protector on the phone, because the built in one does a good enough job. The case will add some bulk to your phone, your phone will be just under twice as big. I have no issue with this in the least. I am a big guy and have large hands, the extra form to the phone makes is fix perfectly for me, YMMV.
Hope this helps
The rubber like sleeve that goes over the case is a dust magnet, just so you know. LOL!