I just got my X4 a few days ago, and I haven't data logged with it yet, but I did have a helluva time trying to get it to communicate with Updater and LiveLink.
I could not get it to hook up at all on my Windows 8 machine. I finally pulled out an old laptop with Vista on it and it was still a royal PITA manually installing the driver before I could get the computer to recognize it.
I finally got it working, and was able to load my custom tunes, and it works great to install one of the custom tunes into the truck.
Kodi - 2013 Kodiak Brown/Pale Adobe King Ranch SCrew EcoBoost, 5-1/2' shortbed, 4x4 and off road pkg, 3.55 locking diff, towing pkg, BakFlip Fibermax, PowerScope power telescoping Tow Mirrors, Amp Research retractable running boards