The Mugen is a very competitive truck, and IMO, handles just like the Losi but is twice as durable. The truck handles great, has a plush suspension, and parts are pretty easy to find. The only thing I would stock up on would be diff outdrives, universals, and rear hubs (if you are using plastic ones) Otherwise, the truck is bulletproof.
is the place to find parts for your MBX-5, MST-1, 777, XB8, Jammin CR, and Jammin CRT. John has the best prices around (especially on kits) and offers great shipping prices!
Just my .02!