I like the OB design, had one on my 3Gs, really wanted to make it my permanent case, but, 2 things ended up causing me to put my incase slider back on.
First, because the phone's screen is so deeply recessed into the case, it's very hard to reach the extreme edges or corners of the screen, and yes, you do sometimes need to.
Second, I don't like the built in screen protector, I realize I can just remove it, but that seems silly and also defeats part of the "3 layer" protection you're paying for.
I have a few friends who have the case and they all have the same issue with the case making the edges and corners of the screen fairly inaccessable. All it would take it OB to recess the screen just a little less, or give the front bezel a different slope/design.
The odd things is, when I called them to ask when the new case would be out, and if they had addressed this issue, the guy claimed they had not heard of it before, which again, is really odd, as it was so clear to me, and every person I know who has the case. Yes, the case does offer the best protection possible, and I love it for that, but with it's issues, not quite enough to use it. And while my rubberized/matte incase slider didn't offer quite the protection, it offers still a fair amount, and makes the phone way easier to use and less bulky. I must have dropped my 3gs in the slider 15 times in my house, on ceramic tile, never a scratch.