We've four Static mats. The two long orange ones have the old screw valves and those are comfy and okay.

We bought two short new green ones with the newer flap valves, one for inflation and one for deflation. I love these because they are easier to inflate and are compact and lighter.

I have had to repair leaks on the orange ones, but that wasn't hard and I used RTV silicone not because it is recommended but because I have it on hand. I didn't try bicycle innertube repair method or the repair kit that comes in each stuff sack.

I do think they are fragile and need to be used to carefully because most everyone in my camping group has these and have had to repair them.

There might be a third valve type out there.

I will recommend these without hesitation. Klymit has exceeded customer service.

Speaking as a side sleeper, I think they are great.