Fantasia is my all-time favourite Disney animated film and also one of my all-time favourite movies in general. I also like Fantasia 2000, even though I don't think it's quite up there with the original. It's still worth multiple viewings.
When I first found out that these two movies were being re-released in December 2010, I was really excited because I had bought the Fantasia Anthology 3-disc DVD set before, which had disc issues with each disc (I tried 5 different DVD players and they all were uncooperative).
After I bought this new 2-disc set, I watched both of the movies and checked out some of the special features. The biggest improvement I noticed was with the dark backgrounds in Fantasia. They're enhanced so that you can see more of the details. Check out the "Tocatta and Fugue in D minor" segment and you'll really notice the improvements.
As for the Fantasia 2000 disc, the video quality is spectacular and the special features are pretty good. It's been a while since I last checked them out, but I usually don't have a problem with special features on a Disney DVD.
If you like Fantasia and/or Fantasia 2000, I highly recommend this DVD set. It'll be some of the best $30 (average price) that you've ever spent.