My wife and I were on a weeklong ASA
class in the Sea of Cortez
last November and the owners of the boat (Lagoon 440) had two of them on the trampolines. When under sail they just ran a line through the handles to tie them down quickly.
They were very appreciated and used often both in the morning for coffee and in the evening for star gazing. They had them for a while before we got there and they appeared to be holding up very well. A quick wash with fresh water after one boisterous 30 knot
plus day of sailing that managed to spray saltwater everywhere and that was all that required to keep them fresh and nice to sit in.
We're saving up and planning for our eventual launch (Haven't got the catamaran
yet...) and we have a saying for things we want to keep or get as we downsize.
beanbags get the "That's going on the boat" approval.
Now if I could only figure out a way to implement a cup holder...