Don't know what you're asking there, but if you're taking a dig at my distaste for coaster brakes, allow me to explain why I don't like them:
1) If you often get off your seat such as to act as your own suspension, the coaster brake is capable of throwing you over the bars by accident.
2) You can't reposition the pedals for maximum torque as quickly. You also cannot reposition them as easily while in a switchback situation. Pedal contact with street is more likely on coaster brake bikes.
3) Unpredictable braking. By this I mean it is entirely possible that, in a panic-brake situation, your legs are in the wrong position to brake. That extra time spent to rotate pedals into position to brake, could result in a nasty situation. The braking action is also difficult to modulate in many circumstances on the road.
4) If the chain breaks, you have no rear brake.
IMO, they have no business on MaBs. But I'm honestly not going to look down my nose at anyone who's running them! I just feel they are unsafe and I worry for my riding brethren. K?