Just another data point:
Like Rex, I was put off by the number of reviewers complaining of leaks. But I had a gift card burning a hole in my pocket and an Exped Schnozzle pump bag that wasn’t getting any use. So when the Flash pads went on sale, I took a chance and bought a regular/regular.
So far. so good. Something about the configuration of the baffles makes it more comfortable for me than pads that use vertical or horizontal baffles. Still no leaks after a dozen or so uses. The last time I used it was in early October, when temps fell into the mid-twenties. I had brought a piece of closed-cell foam to use as a backup, but didn’t need to use it.
I’m a 145 lb side sleeper so YMMV.
Eric, another BPL member, is a winter camper who uses both the regular and all-season Flash pads. I’m guessing he’ll chime in when he sees this thread