Chinese bikes, as a rule stay away from them! Only if you get it dirt cheap, and then consider it like a Bic Lighter DISPOSABLE! Once you use it up it is worthless and they are not made with the same quality of the Jap or European bikes. Like the previous post be cautious!
I tried the china pitbike thing, bought 2 Kayak 110s. Looked great, had disk brakes and Honda knock-off motors. That’s just it. Knock-offs. had crappy ignitions, poor welds, etc.
bottom line, you get what you pay for. Disposable!
I'd spend my money on a good quality used bike first. Look in the classified here and you will see that used XR, CR, DR, TTR, WR, KX bikes are always in demand. And if you maintain it you will most likely get most if not all your money out of it when you move up.