The ES is recommended everywhere for it is good. Too good to be free. In a XDA thread there to, which was then cut off (and you will quickly find the only, if you are interested). With Firewall, so completely offline, I would use the ES (and have done) for DAV, SFTP etc. I suppose but rather Total Commander again. It is essential to me more comfortable and usability / look are well tolerated for free software.