Last week I tried some in a couple of shops by sitting on them while they were still in the cardboard.
One, by putting the saddle half way up some stairs where the stairs go round a corner so I could sit on the saddle properly and lent forwards and backwards, sitting up etc as I would on a bike.
In the other shop I put the saddle on one of those stools that the staff stand on to reach high shelves. The process worked really well. I bought the saddle that felt right and have had a 23 mile and a 48 ride. I was so comfortable that I didn't even think about the saddle, just enjoyed the ride.