What is something really stupid you purchased that turned out far better than expected?
I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn't work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I'd gladly replace if it broke.
Not Focal but for years I wanted to splurg on a pair of Sennheiser HD600. When I finally did it I love them. I don't get to use them often but when I do and some song comes on and you hear some tiny detail a song with more clarity than you even thought was in there before its fantastic.