The San Marco Regal has a similar shape to the Cambium C17 – which is similar to the C15 – by reputation, appearance, and personal experience. Not nearly as well made as a Brooks, but since my beautifully made Cambium broke in two places anyway, all that craftsmanship was wasted on bad design. At least if the Regal dies early it’s cheaper to replace (check Planet X prices).
For me, some saddles are uncomfortable after only an hour. The San Marco Rolls was like that. Felt like I had half my weight on my perineum as soon as I got into a racing tuck. Perhaps as a reaction to that, I then got a Specialized Power with a cut-out that felt comfortable on the shop’s turbo trainer and gave me my first ever saddle sore a week later.
The Regal feels similar to the Cambium, i.e. good for both sit-bone comfort and perineum pressure.