I kinda like the idea of a two-panel file manager, and have tried them all. Not one of them was capable to replicate the power, speed and extensibility of Far Manager, which only fault is that it's windows only.
Fman could be the one if only it was text-based. GUI just ruin it. It automatically means that it won't work from the shell, and it's a deal breaker, that's why I have to continue using mc, despite it's glaring inferiority to Far.