Personally for video playback, it's still buggy with the video either frozen for 5 seconds or stutters, but then playbacks fine. I've found it handles proxy streams better than Jarvis, although the latter doesn't have the freezing issue.
Think that depends on your platform and sources. I've been running LibreElec Krypton Betas on x86, Raspberry Pis and AMLogic S905 platforms, all playing either local H264, MPEG2 or VC-1, TV Headend DVB-T/T2/S/S2 streams or H264 streams from catch-up services (iPlayer, SVT Play, ZDF Mediathek etc.) and all seem pretty stable without the freezing etc.
I steer clear of the MacOS and Windows builds - LibreElec always seems better.