have had six years or eggy use, but i too am fed up with them breaking and wearing out (have SL's, Ti, Twin Ti, C, and MXR ones)
i go through cleats like they are cheese (new and old versions), and have had two sets fail on me on the trail (bearing simply disintegrated) and typically when out of warranty
they get regularly serviced and greased but now finding the springs are worn and there is piss all tension on them now - and i really don't like the random unclipping sensation when flying though the air
so i bought some M540's and slowly doing what 'allthepies' has mentioned above -the M540's are okay, but they don't feel as nice as a new set of SL's, they don't have the float, don't have the mud clearing properties, and are much heavier, but on the +ve side they are cheaper, adjustable and hopefully the cleats and bearings will last five times as long and no random unclipping moments
really want to try the eggy 3's - but not at £95 a go (new xtr's are £80)
