I've got the spigen, too. So far I like it despite the crosses on the back. For me it could be a bit more tacky. I'm coming from an otterbox defender on my razr HD and I could almost turn the phone in my hand by 90 degrees without the phone sliding from my hand. So it was easier to operate with just one hand.
I know that my N3 is bigger, but reading a book would be easier if the case was more sticky (like holding the phone in my right hand and flipping through the pages by tapping on the right side of the screen with my thumb).
Anyone knows if the bounce would work when using the qi-back cover? I know the back will add a little to the thickness, but maybe it'll still fit!?