This series, having recently ended, was brilliant. It seems nothing has been done quite like this before, the university setting feels new and exciting and the characters (especially that of Jack Whitehall) are very funny and relatively deep. The feeling of Jesse Armstrong and Sam Bain, with moments of severe awkwardness that really makes a good comedy (eg. The Office) making it particularly reminiscent of Peep Show.
Seeing as this DVD hasn't been released yet I can't comment on the extras, but if they're anything like other Channel 4 DVDs I'm sure they'll be of plenty and very funny.
Although possibly not up there with comedies like Peep Show or The Inbetweeners, this really is "fresh", it's nice to see Channel 4 keep making gems like this and Friday Night Dinner. I, personally, am really looking forward to it's release.