Motor brakes or mechanical?

Monster Mike has just joined this discussion without knowing. This is a quote from the store (1/8th conversion kits):

*Direct drive - like electric should be. Stay connected to your drive train - this is the most efficient drive scenario for electric power. Power delivery can be tuned on your radio and esc. Motor braking is consistent, tunable and puts energy back into the battery pack. No extra rotating weight, extra components or complexity of mechancial brakes. Less parts to fail or tune. Low weight, optimum acceleration and control. Motor is coupled to the center diff, allowing the chassis to flex as intended without affecting gear mesh or accelerating gear wear.