Just giving my two cents. My back is rubbery, but not squishy, but not slick. I compare it to grips on a bike for how the feel is as far as being able to grip it. It's not easy to slide in my hand.
Sent from a Galaxy Note 3 far, far away....
Moto Defy Green Lens - CM 7.2 / Android 2.3.7
Moto Defy Red Lens - CM 7.2 / Android 2.3.7
Nexus One - CM 7.2 / Android 2.3.7
Galaxy S II - CM 10.2 / Android 4.3
HTC Desire HD - Stock GB / Android 2.3.6
Galaxy Note 3 - Stock Rooted JB / Android 4.3