Planted some BFT once; not sure that I ever saw a seedling come up. Have no experience with it, but my understanding was that it's slow to establish, and a bit less forgiving of overgrazing than the annual lespedezas. Really gotta have a significant 'rest' period to set seed.
Annual lespedeza - when you can find seed! - makes a good addition to fescue/clover pastures, as it puts on the bulk of its growth in the hottest part of the summer, when the fescue & clover kind of shut down. Re-seeds better if you can pull the cows off to let it set a full crop, but I've had it re-seed in years when I really had to graze it hard - 'Marion' saved the day during the drought of '98
Red clover doesn't last long - 2-3 yrs max before I have to re-seed; usually do a mix of medium red and a good Ladino.
Kopu II has been my go-to white clover; Alice and Will are good, but leaf area not quite as big as Kopu II.