Shimano's SPD pedals have been around forever and, aside from a few additions here and there, have remained pretty much unchanged. The reason is simple: Shimano got it right the first time. The M530 still uses Shimano's tried-and-true SPD retention system, but it incorporates a larger platform to add a bit of support in gnarly sections of trail where you're tossed around. The M530 SPD MTB pedal incorporates the same smart features that SPDs have incorporated for years. The dual-sided pedals make clipping in a snap. Sealed cartridge bearings make them pretty-much maintenance-free, although if you need to take them apart to clean and grease the internals, it can still be done without any SPD-specific tools. Finally, there's the tension adjustment, which is why many believers have been riding SPDs for years. With a 3mm Allen wrench, you can adjust the release tension of your pedals, so you can customize the feel to your exact comfort level.