just downloaded it and tried it... mmm... think i'll stick to what i know, besides i already paid for it total commander
i personally think total commander is a little cleaner in setup, eats up less screen estate, has better rename and tabbed / history features, and slightly better packer support (but on that last one i may be utterly wrong, didn't go through all details there)
directory opus has some other nice functions, a built in file viewer, the possibility to jump to part of a path, more configuration options
i must say that directory opus is nice, but it's a little to 'twiddely' for my taste, even as a brand new user i would opt for total commander over directory opus as total commander 'feels' somewhat cleaner, but i admit it is a matter of choice
but again, i already bought total commander, so...
(looks, by the way, not too difficult to do a simple commander / opus thing in pb, well, if i have nothing better to do...

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