They look 99% identical to M-sport models yet are somehow named "M performance" models. Ok I get the fact that they have high torque figures and offer AWD for those who want it but is there really a need for a model to bridge the gap between the 550i and the M5? I think not.
Let's not forget those badges look terrible! It reminds me of people who buy M-sport models and slap M badges on the back. Looks stupid and the name M550d x-drive is a mouthful.