No stuttering. Hard Drive 1000GB is read fix. Movies, pictures, music ... everything is played without any problems. Operation via the attached remote control tedious. (Load acc. Client and Server as an app from Store, install Server on box and set so that app always starts automatically) operation via smartphone works fine. Streaming is no problem. Only, and that is disappointing part Amazon Prime Instant Video will not play. Although Android 4.4, good hardware, etc. All attempts. Smartphone Apps, Tablet Apps, or any combination. Cache cleared, etc. to do anything. Although opens after the Instant Video is enabled for tablets, the browser, if you start the Instant APP and you can scroll through the movies. If you choose one and presses the start button the message "Instant Video app for iPad to be installed". But do not go with Android! Obviously, the box is not correctly recognized, at least with me. Despite Amazon App Store, download Instant APP, trouble-free installation, etc. Too bad. Detour only on Media Center Kodi (XBMC) and installation of special addon possible. But then smooth playback.
Conclusion: Great box with impeccable performance. My new multimedia center. Would I buy it again ...