Me an' my Brooks B17 Champion Special are together in the "If it ain't broken, don't fix it" mode, but that Manta looks like an Intriguing Thing, Richard! Thanks for that link. Dominic seems completely sold on the device, and has given it an extended test.
(Not too sure about the electric blue variant, though. It's a colour I like but which wouldn't go so well with my Raven's black-and-silver.)
Looking at the Manta website, I seem now to recall having seen some other photos of the saddle a while back, somewhere -- on crazyguy, perhaps.
At £125 a pop, I'm not sure I'm about to experiment, but--who knows? If my Brooks suddenly wears out and needs to be replaced, it's worth a look.
And a PS, after reading more of the MANTA website: Matt, these are your people, based in Dunvegan on Skye! (Mine too, but at a greater distance of time and space and generations.) So, I'm thinking that maybe I should arrange my still-to-be-planned tour of England-Ireland-Scotland to include Skye, so I can test/feel/ride the Manta saddle. ("Yes, dear, I'll be away an extra week or so. Planning to visit Skye to check out a new saddle design. Will bring one for you if it seems promising.")
OR - why don't you organize a mini-kickstarter and so that you can buy the thing now and test-and-report on it? I'll kick in 5 - 10 quid (I have
lots of ideas on how other folks can spend their time and money.
)