Re:Zero features one of the best soundtracks in anime (composed by Kenichiro Suehiro). Streaming audio is compressed. Blu-Ray offers or TrueHD . If you have a surround sound system, the difference is night and day. The whisper of the Witch of Envy will creep into your rear speakers, and the bass drops during the "Requiem of Silence" will shake your floorboards.

: These sets are highly sought after for their physical extras. The Season 1 Part 1 Limited Edition

Don't forget the OVAs!