Like OldDude, I also put Linux on relations' computer, in my case, my parents. As users, they much prefer it to the Windows (it was Win2K which had gone out of service life when I changed them over) they had previously. I think the best part of it all round was pretty much an end to "Jon, why has this happened, what did I do wrong?" episodes, etc. While still pretty basic users, they became far more confident through the stability of Linux.