I have one and love it. I usually just have one side up but when I need the extra room it is sure nice.
I have a separate big ironing board. My husband made me one from a sheet of plywood that we covered with batting and stapled heavy fabric over the top. In hindsight I wish I would have made the cover removable so I could wash it. It has some water spots from the iron that I would like to wash out but it is too much work to pull all those staples on a regular basis. Underneath he put some little stops so it sits right on top of my irnoning board and doesn't slide around but I can take it off to iron clothing (heaven forbid).