While I already have the wonderful Imaginationland director's cut dvd, I was still happy that they included the original aired versions on this season set.
The biggest flaw in the director's cut was their decision to use a cropped widescreen. This trilogy had so much to offer visually that it was a shame to see that much animation cut. With the original aired versions on the season 11 set, you get the full frame.
I love widescreen, and would love to see south park go that route when they start doing more HD stuff, but hope they elect to fully animate it rather than crop the full frame versions.