Been upgrading this one slowly,out of the box its durable.. VERY durable but being larger and a lot heavier than a hpi baja and having 4wd i wanted a bit more power than i was getting from it out of the box stock. Its pretty close to where i want it to be now... a little more power,better steering servo,and some taller gearing to give it a bit more top end would make it just right but its pretty good for now.