PLUGINSXBMC just finished a full review of PROBOX2 EX & remote+ (by Spanish). They mainly tested with Video playback (by XBMC) and Benchmark (Aututu, 3DMark, Anomaly 2, SpeedTest, Wifi Analyzer).
To read the full review (by Spanish), please go here.
Video demonstration of Video playback like DivX HD, MPEG4-HD, MPEG4 2K, MPEG4 4K, M2TS 3D HD, DivX MKV, please watch below: