Who Watches the Watchers looks fantastic. The shots of the Enterprise in orbit, and all of the external shots down on the planet - wow!
There was a yellow tinge to this episode originally (kind of like the oft described vaseline over the lens look of STNG SD), the colors are simply amazing. I love this episode as much as when it came out, but maybe a little bit more now!
Agreed, it looked incredible. Pretty much my favourite episode, so I love seeing it refreshed like this.
Also looking forward very much to season five's Darmok getting the same treatment.