This is a welcome Blu-ray release but beware. To simulate the look of historical footage, the filmmakers added grain and colour bleach to the picture in post-production. Because of this, the improvement upon the DVD version is occasionally impressive but usually marginal. Nevertheless, the fact that it is better (along with a DTS-HD soundtrack) makes this the best possible way to experience this excellent series.
There are a couple of new features for Blu-ray: picture-in-picture commentaries by Easy Company veterans and a handy timeline viewing mode, which tracks the narrative chronologically and allows you to access more information on characters and events at relevant moments.