I'll skip Amazon's description and tell you instead that I bought this box set a few months ago, and it's outstanding. The set is loaded with extra features, and the series itself was recorded on film and so looks astonishingly good for a TV show that's over half a century old...but you really want this for the cast. There may never have been another sitcom cast as good as this one--from Dick Van Dyke, (whose face and body seem to be made of endlessly amusing rubber) and a very young Mary Tyler Moore in her first major TV role, to Morey "The Human Joke Machine" Amsterdam and Rose Marie, to the inimitable Carl Reiner as Van Dyke's endlessly annoying boss. If you care about television comedy at all, this series is not to be missed.
(It's also available on DVD for $88.99; there's a link to that on the product page for this version.)