Review on ZERAY Clipless Mountain Bike Pedals 9/16" With SPD Cleats - Dual Platform Design For Road, Trekking, Touring, And City Bikes - Compatible With Shimano Cranks (Cleats Included) by Bubba Baldwin

This review is for the pedals that do not have one side as a flat, but both sides have the spd clip in. I mounted them on my road bike and took a short ride, so I can't comment on their longevity. The clipless mechanism works just fine and they are reasonably lightweight. The description indicates that the bearings are self-lubricating, which means that they are essentially oil-impregnated bushings. If the quality is high enough, these should last a long time without needing to be greased. It also allows them to make the pedal compact, which is nice if they are mounted on a road bike. Their lifespan may be limited on a mountain bike unless you're just riding greenways and buff trails. Rock strikes on the more challenging trails might do a number on the mechanism. The price is certainly right on these. If you've been wanting to try clipless, this is a good way to go.