All these filters do is remove ERRORS in the frames... like the halos around high-contrast edges (artifacts that aren't supposed to be there and look just plain ugly). Notice the white shine left of Vader's silhouette? That's an error resulting from capturing the LD-signal via a SVHS-cable. If you'd watch the laserdiscs, those edges wouldn't be there, and it would look like my results. I work in the field of video-editing and animation for years now, so I know a bit about it. But of course, after all it's a question of taste.

EDIT: Getting back to this, you should note that the result isn't softer or blurrier than the "original" version, it just appears like that. Actually the halo thingy causes the same effect like a sharpening filter, which basically creates halos around strong contrast edges, to INCREASE the contrast at these edges. This makes the edges appear more pronounced. A very cheap trick, since the quality really suffers from this (though it sometimes is used on commercial DVDs... and it's always put on the "con"-side in reviews).