I bought the Klymit insulated static v luxe sl one but decided to return it, the R value is good, but it's misleading, as the mat isn't a consistent thickness, meaning parts of it will have that R value, but parts will have 0 R value.
I ended up buying the Exped megamat lite, the one that's 4.7" thick, R value I believe, was 5.3.
Don't have it yet but am excited for this thing, I love the idea of having that extra thickness and was surprised at how it packed and the weight for the very large size of this thing.
But I was really really on the edge with this vs. that down mat, I'd like to hear what you think of that. It has better R value but is thinner at 3.5", though that's still pretty thick in sleeping pad world.