If you ask me, this is the first time I have felt that it might be worth buying an album DVD equivalent. The Definitely Maybe DVD includes, of course, all the songs, including videos and live performances of each song. The chances are you already own the album itself, so it's the visuals and the live performances you'll be interested in. And both are definitely worth while, although possibly not particularly in the long term - depends what sort of fan you are.
And if you are the sort of fan I am, then that may not be why you got this DVD at all - the key to Oasis (as many fans will know) is the combination between the music and the men. And in the interviews on this DVD, the men are in fine form. They are full of anecdotes, as you would be in recalling one of the most pivotal events in your life (and in modern music history). The brilliant stories of the recording studio on an island, which meant the lads had to leave the pub early to avoid being cut off, and tales of drug-stealing, tractor driving shenanigans with the Stone Roses are joyous, and hilarious, and will catch you up in the magic of the beginnings of Brit Pop. So will the stories from the technicians - dealing with Liam Gallagher for the first time, or pushing the volume up to the max so that Definitely Maybe was the loudest album on the juke box for the year after its release.
And for anyone that doesn't own the album, then remember that this is the classic oasis - raw, swaggering and brilliant. From the ripped off intros to Shakermaker and Cigarrettes and Alcohol to the wonderful solos and sweeping melodies of Live Forever and Slide Away, to the minimalist brilliance of Married With Children and Sad Song, this is a superb, superb album.