I just tried the sync app for the first time (into GoneMad). Brand new device (FiiiO M11) and brand new downloads of MB, GoneMad, and the Sync App. Did a test run of 2GB before I put my (massive) music collection on my device. The 2GB took nearly 30 minutes to transfer. That seems very slow to me, but not having done this before, I don't know. Is that a normal speed for wifi? I tried a wired sync first, and while it was much, much faster, half of my metadata didn't copy over within the files (or at least it didn't show up in GoneMad) and my music library in GoneMad was a mess as a result, so I deleted everything and did a new sync with the wifi app. I read somewhere that wifi sync is more reliable in that regard and indeed it was and my GoneMad library is nice and clean now. But at this speed, it's going to take me a year to transfer a couple terabytes.