Friends is possibly the best and funniest sitcom I have ever seen in my life. By watching all the episodes (for free, no less!), I really got to see the progression the six friends made in their lives from immature mid-20-year-olds to real adults ready to make changes in their lives. You have no idea how sad I was when I first saw the season finale. But, since I have all the episodes, every time I want a little more Ross-and-Rachel drama or Joey fun, I can just go back again and watch another episode!
I downloaded all my episodes off Bittorrent and then burned them onto DVDs so I can watch them on my DVD player anytime. DEFINITELY do this. It is totally worth it.