Multi Commander is the best Explorer for big folders with alot of files. Flat file view and tab sessions and better configurable than TC. The Multirename-Tool is also better than any other. The lack of a synchronisation-Tool and some C++ problems are not good.
The FC Developer have backed the wrong horse. I cant see that this will be sometimes high performant.
I have also huge problems with the english language. But i think learning by doing is better than no learning.