Looks like some nice added stuff in there, but I've never been big into added content, special features, etc.
Not long ago, Best Buy had Seasons 2-6 on sale for $20 each- coupled that with a manufacturer's coupon for $15 each season if you bought the special edition of season 1- got 1-6 for about $45.
Anyway- this season has done a great job of livening up the series. The change in location was much needed, the new characters are interesting and the storylines, for the most part, are fun.