I have a Fizik Aliante VS on my 650c bike that original had a repop Regal but just didn't fly with my behind.
Then two SSM Rolls on my Paramount and my Cannondale.
A cinelli unicanitor buffalo hide that's padded on my Guerciotti which surprisingly is working pretty good for how slim it is.
Then a Vetta TT Trishock on my Schwinn walmart klunker bike.