We've used the F2R in our Rally Schools without any trouble. I think they are fine, even for a long rally.
MD is the gold standard and most people use them on rallies so you can always find spare parts when racing. MD did a minor re-design this year so that the MD can now handle very big roadbooks better.
(I have MDs and F2Rs in stock now.)
The touratech roadbook reader is junk, in my opinion. I used one in a rally in Tunisia, and one of our customers had one in the Dakar. We've also ridden practice routes with plenty of people using touratech roadbooks. Everyone had reliability issues with the touratech roadbooks.