I recently bought a B190 to replace the rather uncomfortable saddle that came with my vintage-style grandma bike. The 190 is generous in size and was comfortable right from the start, albeit a little slippery, but the slipperiness soon recedes with use. I was worried that the saddle might be so big as to look out of proportion on my bike, but in fact it looks just right (pics here - http://i72.photobucket.com/albums/i199/bubcar9/B190c.jpg http://i72.photobucket.com/albums/i199/bubcar9/B190d.jpg ). If you're a big person with a big bike and a big bum, you'll find this saddle very agreeable. As you'd expect with such generous springing, it squeaks a little. But it's a deep-toned, masculine sort of squeak, reassuring rather than annoying.
I bought this saddle as the capstone to my Surly Big Dummy build and with a 230lb frame and upright position I figured the bigger the better. When it arrived I marveled at its size(it's huge) and weight(a mere 4lbs of my bikes 71lb build) but once installed; Day 1: Amazing comfort, Day 30: Even better, Day 30+: I can't imagine it not getting better and better.
In summary the most comfortable saddle I have ever ridden hands down, game over.
I have a B190 (with custom carving on the top) installed on a custom chopper bicycle I built. I LOVE this saddle. My bike is mostly a show bike, & this saddle looks amazing! I've gotten alot of compliments on it & the bike has won several awards. But when I do ride, it's very comfortable too. My wifes custom cruiser will be getting a B72 too.
My wife has a B190 on her 1950's German bicycle. It is fantastically comfortable .. like sitting on a sofa while you ride. When brand new it is a bit slippery, but this soon goes away. Some flex in the leather, together with the springs, mean you are suspended above the road. Not a performance saddle by any means... it's built for comfort.
If you have a bicycle worthy of the B190 (like an Electra Townie), then adding the B190 to it is the best move you can make. It's big, it's heavy and it's expensive but it is absolute heaven for your butt. It's like a vacation for your butt, leaving you to just enjoy the ride.
Is the B190 suitable for fitting to a Brompton, well what I really mean is will the saddle clamp fit the Brompton seat post also is it too much suspension for a Brompton as I tour and do a lot of long distance rides on tow paths and badly maintained cycle paths and I wouldn't want to be bounced off the bike. Many Thanks.
A> It is absolutely not to be used with a Brompton.