I have a PiPo M9-Pro tablet using RK3188. (1920x1200, GPS, All sensors). While it's fast and can run anything, the reliability is really poor.
I had to do hardware reset on the tablet several times, and sometimes it slows down to a crawl for a couple of minutes without any apparent reason.
The tablet is sturdy, the screen looks great, and when it works, it works well. That is, when it doesn't freeze...
For this reason, I still won't recommend these kind of "cheap" tablets to anyone because of the many "bugs" the hardware and software contain... too bad, seems like wasted electronics