For me, the app works quite well. I have especially worried me for a quick (child-friendly) access through the "normal" FireTV UI on einzele Shares. I have (surprisingly) apparently hardly formats that are not - or only with no sound - will play; AVI & MKV function as MP4s of Onlnie TV recorder, etc. MPEG2s primary cause problems. I just had to do the "new media engine" in the settings to really. But I also expect not from any app the functionality of XBMC / Kodi (which I still have in addition). DLNA of the Synology DS415 + as a media server works as easily as SMB access to the DS as a server. I think only the GUI un-intuitive and the app crashes occasionally and see. For my purposes, but quite OK.