I don't know if it will last as long as a leather brook, but it is very well made, much better made than a standard b17. It is comfortable but it does feel different to my b17, still you don't notice it while riding. It does not look as good as a b17 on my thorn.
But we kind of her hung up on brooks saddles but there is many other leather saddles on the market. So brooks have diversified and broken tradition.
Ask me again in 5 years what I think, I will either still be happy or the rubber brooks will be collecting dust in the garage.
Peter