sure yeah it's really nice. But it's not a park bike... it's a Dh/fr bike.. theres sooo much more potential in that bike if it had a real crank. and there is alot of mtb cranks out there that are lighter then bmx cranks.
the cranks do just fine on the mountain, the cranks have nothing to do with what type of riding it is they are geared hard, (fork,shock, rims, tires, handlebars all play a factor and are all dh/fr)