To contradict myself a bit, I have a BSP D8-Pro that I used to use with my tablet before I sold it. I use it occasionally with my phone, but it doesn't seem practical to carry it for short distances while I also don't want to ruin the battery of my primary phone.
Realised that I needed something more pocketable and from the 2D era to while away time when basically waiting around at different places. To that end, I placed an order for the Miyoo Mini Plus because of all the rave reviews for Onion OS and how good the D-pad and face buttons are in comparison to same priced Ambernic devices.
I can still reject delivery at door is what I have been told, so still weighing whether I should go for the Ambernic 35XX Plus or 40XXV instead for increasing the scope to N64, Dreamcast and PSP, though the opinion is pretty clear that those consoles are not particularly usable at full speed, work really poorly with a D-Pad and that the Analog stick in the 40XXV is really poor.