when i am saying originals i mean the bosch made ones that are the proper motor on arm type and not the after market cable over the handle winder type. the differnce in cost is the cheap cable driving the window wnder handle ones are around ?100 for the pair and the bosh are nearer ?300 for the pair, but the bosh ones will be reliable, quicker and smother.
fitting wise the bosh is harder as they require the window mechanism to be removed and replaced, whereas the other type just use the mechanism thats already there and simply drive the winder handle spline.
depends what you want in the end.