Shouldn’t be. For those with an LCD, with the added control and benefits in 3.5.5, the HD screen should also benefit more. If you can’t by an OLED version, $100 for that upgrade is probably a good deal.
You may need a bot. Those things will sell FAST.
Apaprently, it will boot if you just move the SSD from one to the other. Don’t know if it will update the OS properly with that method, though.
According to the video reviews I’ve seen, there are many threshholds (40, 60 and 90 Hz) so it can effectively run at 20Hz if needed (though why you’d want to run that low is beyond me).
To answer the question for those wanting to revert, power the deck down, then hold the … button and power it up. Select the second option (B) and your deck will load back up in the previous version.