I've been wearing the 54S for a few months and really like it. It's comfy, easy to clean and seems to slip through cross winds better than my old FF. I don't notice much ventilation with the sun visor up as it blocks the top vents but it's no worse than others I've worn and I can feel a little air circulating with it down. I use the light on the back frequently and will probably add the kit to tie it to my brake light soon. Part of the seal on the left side of the modular piece came loose (glue didn't hold) but it doesn't affect anything so I'm not concerned. Overall it's a very good helmet, especially for the price.