While the M520 lacks the flash of premium options it does basically the same thing for a small weight penalty in a package ...
If you find SPD systems too rigid then the Crankbrothers Candy pedals may well be for you, but you'll have to look after them ...
If you want a very good, long lasting, serviceable, lightweight set of gravel pedals with great foot retention all at a price that undercuts other brand's range toppers then you need to get a set ...