I have an 60GB Apple iPod Video which I bought under the excuse for a trip to Scotland. I use it as a portable hard drive and backup for my camera (I bought an adapter for it as a 256MB xD card doesn't hold much when I take pictures).
All of my music is on this baby and I take it everywhere. I have 20GB free on my iPod (it's not all music, as my collection isn't that big, but it's getting there).
So far, there haven't been any problems aside from a few scratches when I've dropped it. Surprisingly it still plays after having those run ins with a cement floor. ^___^;;
People have told me that their CD player is enough for them, but that's their own thing. I don't have to bring all my CDs and it takes 5 seconds to find the album I want to listen to and I'm set.
Oh and for those who think I'll never listen to all the songs on my iPod -- I have different lists for each of my moods, so I will listen to a variety of songs each day, not the same thing over and half of what's on there goes unappreciated. I like my music.