I never used a case with my XS because its glossy and not slippery in my hand. I used a case with older phones that were matte aluminum because they seemed to want to fly out of my hand. How is the 12 pro as far as that. I see the edges are glossy but the back is matte finish. I don't like using cases but if its too slick I might have to.. Is the 12 pro slick or pretty grippy without a case?