i have them and they´re kinda good,there´s really slow leak(you have to bleed them once or twice per season,not that bad imo).pros:lighter than maguras,slaves use better material and looks nicer,levers are longer=stronger brake,plenty of colours.only problem for me is that slaves have shitty dust rings,so if you´ride often in the dust,it gets inside and damage sufaces of piston/slave. overall better perfomance than maguras,they just won´t last as long as maggies.