In this review, I won't be reviewing the series itself (because it should already be clear it's amazing). Instead, I will give you details about the blu-ray edition itself.
The box is very simple, but it looks neat. We're talking about a cardboard box here that's 4.7 cm wide. The cardboard is plasticized, so it should look good on your shelf.
The video quality of this blu-ray is good, especially for a TV-series. The pictures are sharp and the contrast is amazing. The only letdown is that colors (for example of one's skin) are sometimes a but flushed. The audio however is wonderful.
Each season is packaged separately in a thick blu-ray box. Every box contains thirteen episodes and some bonus features, divided over three discs.
Finally, here are some details languages the audio and subtitles:
Season 1
Audio: English 5.1 DTS HD Master Audio (commentaries 2.0 Dolby Digital).
Subtitles: English for the hearing impaired, French.
Season 2
Audio: English 5.1 DTS HD Master Audio (commentaries 2.0 Dolby Digital).
Subtitles: English for the hearing impaired, Cantonese, French, Korean, Portugese, Swedish.
Season 3
Audio: English 5.1 DTS HD Master Audio (commentaries 2.0 Stereo).
Subtitles: English for the hearing impaired.