I have had my iPod Classic 160GB for nearly 2 years now (upgraded form a 1st Gen iPod - which I still have).
Ok so its got all of my record collection on it, around 30 days of music. I also rip dvds I own to play on it, and it has paid for itself alone in not paying for headphones on planes to watch the movies. It can easily fit (along with the record collection) around 100 movies or 200 episodes of TV programs (DVD box sets are a particular favourite of mine for long train journeys and holidays alike).
As well as this I subscribe to a couple of podcasts such as best of YouTube, which is always good for a laugh.
After owning it for a 18 months I discovered the quiz that asks you random questions about your music collection.
Now more and more TV's are coming with ipod docks, so I can play video through the tv in my Kitchen, which led me to buy a RGB add on cable (from the pound shop - for 1 pound) which lets me play the thing on my 42" LG TV (OK the picture quality isn't dvd standard, but it is better then VHS). The pound cable (I bought a few) also lets me play the music through every stereo in my house and I have a similar one that jacks into my car.
After 2 years it is still the first thing I make sure I have packed before going on holiday, the screen is unscratched, the battery life is as good as the day I bought it, and with the use of the 'in your ear' bud earphones the volume is perfect. The only thing I disliked about it was how quiet it is with the earphones supplied.
As I said, best 'gadget' I've ever bought.
I have a wife who borrows it to take to the Gym to watch TV series, and listen to her choice of music, and I have all the charlie and lola and Peppa Pig DVDs on it to keep my 5 year old entertained on long car journeys.
It also has every digital photo I have taken for the past 8 years on it (1000 or so), which is great to show the grandparents!
If that hasn't sold it to you - you don't need one!