The brushed version of the E Revo has nylon trans gears, where the bl version has steel. Not sure, but on many of the brushed version of traxxas', the axle carriers have bushings instead of bearings, like the bl version do. Bl difs will be different as well. Just really depends on what you're long term plan is. If you can pick up a brushed version for the right price, then I would say go for it. If you decide to go bl in the future, it doesn't have to be a MM.