The directors' cut of episodes 21-23 was something of a lightning strike, whole new facets of the story were realized. Unfortunately, this DVD, of the last three episodes has nothing like the same impact. Even counting a more revealing version of Asuka's bathtub scene, there probably isn't 90 seconds of notable material. There is nothing that changed the overall meaning if the episodes at all.
The ending of Evangelion has always been difficult for fans. Everything promises an apocalypse and instead we get an internal journey and an epiphany. I happen to like the ending, perhaps because the stories of fan disappointment prepared me for it. As he has done all throughout the series, Anno stays focused on the characters. While the film version, End of Evangelion, focuses far more on the story. While less meaningful, it is far more affecting.
If you don't have the last few episodes, then this is the best way to buy them. If you do, then think twice. Whether you are happy with the purchase will depend more on your need for completeness. For me, expecting the same discoveries that Resurrection provided, this was a disappointment. Good because the original was good but offering little to justify the additional cost.