I've got shineray X5 and it's not bad. Sure it's vibey over 6000rpm and the brakes are not great but the suspension is pretty good and it's comfortable enough with a good sheepskin. I geared mine down and it does 100-110 km/h comfortably. In stock configuration it would prolly do around 120 comfortably.
I dare not ride faster in China as them farmers never look while driving or walking.