"Russell, can you elaborate on this a bit? Do the GG CCF pads have better warmth? Longevity? What? I froze on my ZLite and want to justify switching to GG pads this year, even though I only have 1 night on the GGs."
I'm not Russell, but I'll chime in here. The GG pad is thicker, with a more pronounced eggshell pattern. It's also made out of a material that is slightly softer than a z-rest or ridgerest. I find its comfort level somewhere between a ridgerest and a thermarest prolite 3. It also provides about the same amount of insulation as a ridgerest deluxe, so it's probably close to 50% better in that regard than a z-rest.
The GG is also more durable than a z-rest, though not quite as good as a ridgerest in this regard. It will compress over time, but you're talking in PCT or AT thru-hike type of usage.