A somewhat qualified response, but Chinese manufacturing has come a fair way in a short time.
I had cause to replace a lawnmower motor, and it had to be cheap. It gets a hard life. Put on a 5hp Loncin. I was impressed with the quality of the castings, and the more we use it the more impressed we are. I say "we", my brother was involved and was not keen. He now can't wait for his own Briggs to blow so he can replace it with the Loncin. He has changed his view completely.
Of course, I don't know whether Qianjian has done the same.