One of the reasons I went with SL is because of the size of the XL as a 400lb 6'6 dude, ama big boi xD. I heard that they take around a month to break in but afterwards they're pretty comfy.
And it's the creaking with my chair that I find the most annoying, especially when recording videos! I figured that I would dish out that extra $ for a SL in the hopes that it'll last a lot longer xD