I've not noticed any quality issues with our Smasher. Seems like a pretty tough rig. I wouldn't mind getting a couple more of them along with a few of their other trucks.
That's one of the main reasons I don't buy Chinese brands. I have gone through the same exact stuff a number of times with banggood. And that is exactly what they did to me. Every reply from them was another question. It took me 6 months to get a replacement part the last time I had a problem...