I picked up a used (new condition) Chinese 125 quad for my young boys last year. Others told me not to... I'm telling you not to! No power, terrible gearing ratios, vibration cracks in plastic and steel bumper, headlight fell out, rear sprocket bolts fell out and stripped, leaking gas vaulve, replaced CDI, front shock broke in half, seat plastic broke, squirrely steering. And all this with very little use, dosen't get used much cause it down most the time.
Just from a power and gearing perspetive, any hill, and we all know there are no hills hunting out west, will have you wishing you'd have not bought it.
Please, please, please listen to me, don't buy one. If its the price point that's a concern, look for an older name brand quad.