Seeing as how I am watching Season 1 and Season 4 at the same time, I can say that this episode is really amazing. It shows Don and Betty's 'perfect' suburban life, yet is also shows an underlying tension between both of them, tension that will only rise and become their central conflict in the future. Also, this episode we get the introduction to Don Draper's mystery life, who was he before? All of these story lines, together with Sally Draper's birthday party, which shows us how life in the suburbs and how couples treated each other back then, were powerful. Here we have an episode that is surely to be looked upon in the future as saying 'Ah, here is where it all started'.