My first computer was an old Windows 95 machine, I learnt to use it when I was 3 years old, and then I got a new XP machine. My father took it because his 'wasn't as good'. So I was given back the 95 one.
After that, I got a Macbook G4, which worked great (until the buttons started falling out, the screen pixels died, and I had to duck-tape the battery on to keep it from falling out...
Then I got an Intel iMac about 3 years ago at christmas. It works great to this date, and I won't get a new home computer for another 2 years.
I also got a new Macbook about 5 months ago, and it works great too!