I had one, the very first of them, when Brooks was offering them for testing. They were not for me, and I went back to my B17 quick smart. That said, I am not a fan of plastic saddles of any ilk, so take my comment with a grain of salt
Brooks has built all its reputation on leather saddles (like it or not). The attempt to keep the same shape but replacing leather with synthetic material wouldn't do any good, meseems. The point being, a leather Brooks saddle will break in over several months while the synthetic model wouldn't.
Modern saddles might be made of synthetic material but are sophisticated, starting with the pressure relief channel...
I’ve seen you post in multiple threads about your hunt for a saddle to replace the wide one you’ve got on your bike. I suggest you try some varying types of cheapo saddles (both with and without horns) to find out what you want/need and then look for a permanent one.
The cheapo ones you find on Amazon, etc, will not last. I had one where the rails disintegrated from metal fatigue, but I learned what I was looking for for comfort. I guess that’s my point.
Anyway, many of us have lots of recommendations to give, but it would be foolhardy to recommend something to you or weigh in on the Brooks you showed here. Good luck with the hunt.