Among the Shimano SPD pedals I own (M9000, M8000, A600, and this new ES600), the ES600 is the latest and lightest pair. It's similar to A600, but very slightly lighter. Since it's single sided, it is not as convenient as M9000 or M8000, but the difference is not that significant for on-road use. The only downside is the paint of the surface. It can easily get scuffs during your first ride. A600 has the same issue, but overall I prefer the appearance of A600.