In terms of image quality, the Blu-ray represents a significant improvement over the DVD. For fans of the show, that alone should merit an upgrade. The supplements are just icing on the cake.
Having seen the masters for season 1, I can tell you that the Blu-rays essentially mirror the DVDs in terms of format (meaning no bumpers or Four-in-One intros... I mean, unless something dramatically changed in the last few months, but I'd be surprised as hell). In terms of image quality, they...