My nephew owns a RT-sport and i was sceptical about the durability when i bought and saw it the first time and i was right, because nearly all pinions weared out at the first ride.
I must say that there is no slipper mounted, that must be the reason but there are upgrade parts for the gear and it helped.
Dont ask me where to get them in the US, i bought them in Germany and we have no problems since then and there is still no slipper mounted, the gear is bulletproof since. The only thing to mention is that you sometimes hear the motor pinion jumping teeth during instant accelleration but the 82T pinion is holding up fine and if i push the motor pinion hard against it and fasten the motor screws its ok for a while.
I used to own a Evader ST-pro Graphite and i must say that i had problems with its gear too, not to mention the ball diff which i could hardly setup right and if i did, it just messed it self up and started making sounds after 1 battery, god i hate ball-diffs. The RT-sport shocks are shorter but you can replace them with longer ones from Asso or evader etc.
The motor mount on both is aluminum and it really helps keeping the motor heat down a bit more.
I also mounted a delrin front bumper on the RT-sport and after some hours of bashing there are still no broken parts, i really recommend mounting a larger front bumper on your car, it really safes your front suspension parts
The ST-sport has no ball-diffs and its working just fine, i must say that the Evader was more likely for racing and had more setup optins but thats good for someone whos seriously racing, i just wanna drive and not setup and rapair all the time.
For this i blame the brands, we know that its possible to build a bullet proof gear which can handle high power motors even without a slipper, yes a slipper is good though but you cant make wheelies with a slipper.
So what, a bullet proof gear would weight more? i dont care about 30,40 or 50 gramms more. It would be more expensive? We all spend money for aftermarket parts to improve the car.
It would be durable but not on race level? i dont care iam just a basher and it makes shurely no sense running a expensive, lightweight and fragile car at your backyard.
It wouldnt be profitable for the companies? Well, iam close to quitting this hobby because iam tired of buying parts which i believe the company could have done better and i really believe that they make weak parts on purpose to get more money out of the customer.
Dont get me wrong, its normal that chassis parts break if you crash into a wall or something, thats not what i mean, you know what i mean
So the Academy Rt-sport is a good car for bashing but dont forget the front bumper and gear upgrades.