i don't have personal experience with the rd cranks but i did ride the xd model which i think is comparable. they were okay, not spectacular. if i were to choose between the square tapered suginos and the isis truvativs i would go with the isis setup. there's some debate that the squared taper bb's are better suited than isis bb's for urban riding/skidding but i don't skid and i like the increased stiffness of the isis bb.