We just tried one in the FCO HGI and seriously thought it was a Sleep Number bed that they'd failed to plug in. It was incredibly soft and saggy. Moving the dial from 1 to the max as we had in the afternoon didn't seem to make any difference at all.
It felt like the kind of mattress we've encountered in 1* hotels in our younger days. Mrs. Fredd even tried to sleep on the floor on the duvet but that was
too firm.It took her back a couple of days to recover.
I'm guessing we must have been doing something wrong. I certainly didn't post here to disparage it. Any ideas what?