Yes, I may miss the neoprene. I have wet wading socks I could add over or under. I have a cheap pair of water shoes for getting in and out of the tube at shore. Maybe pick up those simms zip up booties? I would wear wool socks and fleece pants under them just like the breathables. Fifteen dollars sure does sound good at first glance, but would a hundred dollar pair of breathables last longer, and be less trouble than 6 pair of these? I guess my main question is durability. If they tear apart at the crotch the first time you bend over in them, like the cheap pvc rainwear they give you at construction sites, that's a tough patch.
Comfort is another concern. In my tube, my rear end is in the water. I think breathables don't really breathe while submerged, so it should be close to a wash there.
You know, this is about as far away as you can get from a dreadful financial decision if it goes bad. I would still like to hear anyones thoughts, but I should probably just pick them up and report back myself.