My primary machine is a Medion, bought March 2005,
added a floppy drive when first got it and recently both optical drives failed so now has a new samsung DVD RW.
Now having a spare ide connection I fitted the old 160G hdd from a failed TEvion HDD recorder and use it for Acronis backups.
So all in all not radically different from when I bought it.
But if I look at the previous machine :-
Case, motherboard, CPU, are the only original parts the rest changed to speed it up even the op system has been replaced by linux and I keep trying different versions to find which I like best.