My sister got the kids a chinese quad when the kids were young.
First one was given back after a month under warranty. It would never start and most of the bolts vibrated out.
The second one only lasted abit longer

It broke down just about every day.
In the end my father and I refused to fix it, cause that was all we did when the kids wanted a ride.
My sisters rational for buying it was its only $800 with a warranty. Well a warranty is useless if they never go and the next one is the same. It was eventually given away.
A mate of mine got his kids a Suzuki LT50 second hand. Payed $600 for it. Used it for 4 years and sold it for $500.
I know which is the better deal.
Same story for other friends 2 wheelers.
The chinese will get their act together one day but i would give them more time before i look.