Yes I did the same for my parents, who were stressed about doing stuff like online banking on an XP machine after support ended. Installation was a breeze, everything looked perfect, amazing OS. It put itself nicely next to the existing XP installation, just in case they really didn't like it. Good to go, but...
Then the little annoyances started: Caps lock doesn't behave like it should (not a US qwerty keyboard), everything is a mix between English and our local language, the included firefox doesn't play nice with the online banking website, and so on. I know that each of these problems is easily resolved by someone that knows a little bit what they are doing, and some google skills (set up capslock behavior, learn to deal with English, included firefox version has known issues with some extensions, etc...). But for people that never even heard of linux before, that use it only for "where do I click for my online bank, and the internet?", this is a nightmare. Ever tried to apt-get somthing over the phone with people that don't even understand why every command has to be typed just right?
Long story short, they still use XP. Next time I am over, I can try to get everything set up right, but for a first user experience, this is very unfortunately a bad experience.
TLDR: Linux, why you always have stupid small problems and shoot yourself in the foot?