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.
I didn't understand the hype, everyone was saying "it's just a small convection oven". Sure it might be, but now I've used it, it definitely cooks differently and I much prefer it to my regular convection oven. I have been converted.