Pros of beta:
- You have the very latest, top of the edge kernel (currently jz-5.14) on your device
- mtp (although, working much better with linux than windows atm)
- Real sleep mode on all devices (stock can kill your screen on the rg350m because it doesn't sleep for real)
- Better screen colours if applicable, corrected a few
- Exact 60hz and 50hz display refresh for all devices
- True 320x480 display for apps that request it on related panels (for example, Super Mario 64 and Diablo on the RG280M/V greatly benefit from it)
- Overclock possible on jz4725b and jz4770, albeit heavily hardware dependant on jz4770 for now, some devices just won't while others are happy all day at 1200MHz
- Underclock completely reliable, 8 hours travel? Play picodrive at 600MHz (or less)
- A much better, opensource GPU driver on the jz4770 than the old closed source one.
- Recent, actively maintained emulators, compiled to take advantage of beta, with GCC 10. Gambatte with dot matrix 3x hardware scaling on the RG350M for instance.
Current cons/known issues :
- You have the very latest, top of the edge kernel (currently jz-5.14) on your device and once in a while a nighties will break stuff (Rare, but it happens. YMMV). You can always boot the latest working version though.
- The RG350M has a display graphical glitch when starting and closing apps
- The minimum volume is quite loud.
- mtp is unreliable on windows
- lepus (jz4760(b)) has no underclock/overclock option for now, an issue with SD cards (can be difficult to flash) and some have a display glitch once in a while, that's the caveats I mentioned with lepus in the original post.