I'm interested in getting a Flyer, probably pre-aged.
My wife has a B67s which I think is the woman's sprung version and she absolutely loves it, never ever gets saddle sore. I'm sure it's a bit heavier that most saddles but for the comfort she gets, is more than happy to pay the price.
Whether you want or need 'sprung' will be heavily influenced by your riding position. If you are riding upright, with more weight on your backside, then sprung will almost certainly be more comfortable than solid.
If you're on drops, with less weight on your backside, then there may be less need for it.
I've often wondered about the difference, if any, between a suspension seatpost and fixed saddle v. solid seatpost and sprung Brooks. I suspect over the next few months I shall find out;-)
At the minute I am on the former and although comfortable, the seatpost is irritating me as various shims/spacers wear allowing fore-and-aft and sideways movement all at once.