A revelation!
I am a female cyclist and have been riding road/mtb and touring bikes for years. Have recently been feeling like I has been sitting on razor blades after a few hours cycling, particularly off-road on bumpy terrain. Thought I'd try this after reading about them in Cycling Weekly, think the 2 prong style was recommended by Katie Archibald. Have just done 15 hours over 3 days on trails and apart from feeling a bit bruised on the sit bones (which is tolerable, in my experience like the feeling using a harder Brooks saddle) the unbearable soreness / pain (when peeing) is gone. Its harder than I expected but allows you to move around more - you can move right to the front of it and get relief. It looks a bit odd, but who cares? Am really pleased I bought this and am getting a PN1.1 for the road bike next.
Pros: Comfortable