u/HumanIsolated

I'm camping with my son next month and wanted to get a decent pad to sleep on. I see s2d has their memorial day sale for the camp plus SI, but also has their seconds program where the previous gen is cheaper but only comes in size large rectangle. Im not a big guy, 5'8" 175, so not sure if the large is unnecessary or too much. Other than size, is there a significant upgrade between the newer camp plus si and the previous gen? Any other $80~ pads worth noting? We usually camp out from spring to fall.