How often does mounted combat come up in your games? Do you ever bother creating characters focused on it? How have you dealt with the high-level issues? (Specifically, if you aren't a paladin or a druid, any mount you have is going to die in the first high-level area effect or breath weapon its exposed to, save or no save.)
This assumes standar warhorses and similar beasts as mounts. Dragons or the like are an entirely different story.
I'm about to start playing a mounted-combat-focused marshal in a campaign, and as much as I like the image, I can't help but wonder if I'm just throwing two feats out the window.