Works great even with long sequences of data transfers (6+ Gb of music onto my phone). Much better than MTP and doesn't require the wire. Only missing feature for me: some other ftp servers (that didn't do the job) allowed me to specify that only connections from my local wifi were acceptable or only a specific IP address could connect. Not a blocker, but it would give additional security.
Important feature Add auto run of service and add app autostart and it becomes perfect. Not everyone can wrap their heads around Tasker and autostart n stay
Works well Only niggle was I had to get to the ext sd card via root, the simple menu item for it got me nowhere.
unable to get write permission into my SDCARD!
Works great with Windows Explorer, create a desktop shortcut, then change the Properties > Target: %windir%\explorer.exe ftp://192.168.0.xx:2221... replace xx with the ip octave provided by the app.
Couldn't get R/W access to internal storage on my device. Other than that, works well.
Fix delete/rename files in external SDCard in Android 6