I loathe the stuff. I have just made a lovely three-layer lemon cake with buttercream icing it was lovely since you ask
But the buggering sugar goes everywhere when you make the buttercream with the electric handwhisk and I hate having to wash up the food processor between the cake batter and the icing, only for it to get dirty again.
I may never use icing sugar again - at least until next time I the baby I'm having wants cake.