I have this saddle. It was suggested when I got a bike fit to relieve numbness. I find it very comfortable and have not experienced any numbness since getting it a year ago (outdoors on rides of 2 to 5 hours).
On the trainer I get some discomfort on the sit bones after 1 hour. I think this is just the usual trainer issues and standing helps a lot. Very rarely I will get some numbness on the trainer but readjusting my position fixes the issue.
I would recommend it.