Star Wars: the Biggs scene that was added back was cool. Some of the restored dialogue "Close the Blast Doors" and Threepio's tractor beam line.
Empire Strikes Back: No changes, was a perfect film to begin with.
The way the final scenes were hacked up to show Darth Vader arriving on the Super Star Destroyer were ridiculous. And losing "Good thing you don't taste very good" was just criminal
Return of the Jedi: No changes, but the film isn't perfect. Nothing in the special edition version was perfect either. Could do with some major re-editing/truncation during the Han Solo rescue from Jabba's Palace sequence. Actually prefer the uplifting yub-nub song to the new one.