I have both the 28's and the 40's and both are pretty amazing tires in my opinion. My former go to gravel tire was the Clement Xplor until I rode the Gravel Kings. The GK's are VERY fast tires, even compared to my Clements which were already great rollers and the traction is surprisingly good despite the low profile tread pattern. I also really liked the cornering stability on pavement with the low profile side knobs.