It didn't work well, if I remember correctly. I have never seen (or heard of) a swashbuckler in another function as a easy accessable prestige class for rogues. The daring outlaw feat change it a bit, but really, the swashbuckler didn't work well.
But the major difference is: The swashbuckler can reach a decent defense even though he only wears minimal armor; the Bravo doesn't need an armor at all for defense, but becomes a lot squishier in a fight. That's what I meant with the low endurance in a fight - he will be grinded down faster than the more heavier fighters, but at least he isn't hit as often. This works mostly because of the Armor as DR rules.