Having finally picked up the racks (they did turn on Outfitting), and then trying the Seeker missiles out in a CZ, I was a tad disappointed, having never used missiles before, by how little damage they did. Mind, I tried them on a Vulture, without checking to see how good its shield's were. Someone once recommended that I put Packhounds on a T9 (after getting the necessary allegiance), for defence against pirates, and maybe they're more powerful, but the worst part of missiles is that you don't just select a target and 'fire and forget'. You actually have to get the target lock, which takes us back to the T9's slow turning rate.
Unless I can do a lot of damage immediately after submitting to an interdiction, I just can't see missiles being much use to me (outside of mining, of course).