I'm impressed with how the 5C ends up feeling in the hand. The hard coated surface manages to not feel slippery but still have a certain heft and solidness to it. What's interesting about the 5C is really the way its rounded corners all seem to have the same radius, which gives it a very unified feeling in the hand. The front, edge, and sides all share that same rounded profile. It still retains the same overall profile as the iPhone 5 as well. Buttons on the 5C are clicky and responsive, and also have that same hard coated feeling without feeling cheap. That's really the important thing about the 5C, it had to be solid while still being made out of polymer, something OEMs in the Android space still haven't quite nailed down.
The internal metal structure also helped the 5C feel rigid, the back side doesn't deform or press in like I've felt on a number of other all polymer phones. It's clear that Apple had its mechanicals nailed down for the 5C design to make sure it was rigid even if it was still polymer.