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 🙁