My experience with pine64 in general, or with the pinebook in particular: cheap & transparent (and that's what makes them so amazing), various OS versions available, but some work is required even if it's preinstalled.
AFAIU they take no responsibility whatsoever for the OS.
I had no significant problems with the hardware.
PS: I don't think the PineTab2 is cheap. The Pinebook cost €99 plus shipping from China, which basically doubled the price.