I didn't say I didn't like the slot, Jawine. I've only tried the one from Terry, and didn't like it well enough to keep. But, since I rode it an hour before going back to a proven saddle, it least it wasn't instantly objectionable, like far too many saddles. Like you, I did like the harder gel saddles, such as the Selle Royale that came on my Gazelle. Like yours, incidentally, it couldn't exactly be described as "soft" but it was comfortable after several hours, which is what matters.
My experience with the Terry did make me wonder whether the guys who cut keyhole slots in Brooks saddles aren't on to something. I'm terrifically busy, so someone else will have to find the piccies on the net. Sorry.
Andre Jute