What wfdfiremedic said (one of my wheels came off after the first 15 minutes of running it) and check the slipper clutch nut (mine needed minor tightening).
If you're going to change the gearing keep an eye on the esc and motor temps. I had it setup to run 65+ and it got extremely hot and I've since switched back to stock and it's running cool again.
On durability, the truck is very tough. I've flipped it at least a dozen times on my street and everything is fine. The only thing that I could use is a new body because it's scratched and there's a minor hole from a long slide when it flipped at high speed (did a wheelie near top end with the 65+ gears
Also, the max amps rtr for the vxls is a great setup, the truck rips with that battery. The hyperion charger and lba balancer are easy to use.