Here...there be no spoilers. The review posted here earlier did this phenomenal, hilarious and insightful finale no justice, so let's set the record straight.
Joss Whedon is well-known for doing things his own way - and in this episode of Buffy he does so, showing off his quirky goodness by allowing us a finale that is not action-packed, as is custom, but rather thoughtful and amusing - a wonderful wind-down from all that's come before. "Restless" is like the antidote to the anxiety that built up in the season preceding it. However, despite the fact that the entire episode takes place within the dreams of the main characters and has little to do with events in the world, in this episode we get to know our beloved Scooby Gang better than we have. Xander's worries and Willow's insecurities...all that noise.
In seeing the dreams of the Scooby Gang we see them anew. Also, we meet The Cheese Man, a cult favorite (you know you want some) Seriously? No complaints. Watch and enjoy. The mere existence of an episode such as this is evidence of what's so wonderful about Whedon and his Buffyverse.