Hey guys, need some quality input here. First, how long do you think a set of endurance stirrups - for example, EZ riders or that type - out to last before the springiness disappears? Also, what style do most people use these days - with cages, w/o, plastic, aluminum? Finally, I had seen once some kind of contraption that connected the stirrups to the leathers with a kind of spring function - to provide more cushioned effect for bum knees and ankles and hips - anyone know where to find such a thing? Thans!