I have two Brooks Pro's that are more than 10 years, one was left in the car and beat up by the sun (my bad). It's still ridable but not for my Century rides. The second is in better condition and is currently on my Giant. I have a third (not a Pro) but it's not installed yet. It's going on the commuter and the oldest seat will move to my backup bike.
When a Brooks saddle works for you no other saddle will do. The Pro's were broken in in less than 50 miles. The second Pro was ridden out of the box on a 20 mile test ride and then a Century. The Pro is the only saddle that I'd put on my bike new and ride a Century with. I don't worry about the weight as I carry much more on my body (and in my Camelbak).
The late Sheldon Brown convinced me to try the saddle and I haven't regretted it.