my main 2 problems with extplorer are these:
1 in its current implementation you cant really get access to files outseide of the shared folders stuf, so for example files in /home (coutchpotator and stuf) or in var/www (like plugings for owncloud) are (sadly) out of its scope.
2 the slighly lesser pain in the bum, is that it issn't capable of handly ACL's witch can be an issue if you want to share a single folder like /media but waint to lock out the kids from media/adults
3 a last thing i found out, copying or moving files from a to b can be a **tch too, specially if target folder exists you wont be offered to 'merge / replace' but you just get an exception_error but i will have moved / replace anything that ccoured befor that... this makes it incredibly unreliable.
please not that this is not a support request; but only a bit of background info for those who want to look in to this, if you want reliable data management atm your mostly better of using the cli and commands like cp and mv