Being a dad of a toddler, I don't tend to get that much time to sit and play, but it doesn't mean I can't print and read FS Wiki entries. I had been poring through the FS2 weapons database and remembered something about the MX-64 that I'd read (how it was a good tool for intercepting bombs), and how I'd somewhat accidentally blasted the forward beam cannon off of the NTC Maelstrom with a barrage of MX-64s. So, I started paying more attention to the humble heat-seeker, and realized...
This is a great missile. It's got a range of 1900m, no lock-on and decent off-boresight firing (if the target is just out of your forward view, you probably will still get a track), and rapid re-fire. Eight missiles knock down any turret on the Cain, which is nice because you can start to engage turrets on a long-distance attack run, and in a bomber like the Ursa, each missile bank holds twenty MX-64s, so two banks gives you the chance to engage a bunch of turrets on a single run if you start at max range.
I would imagine that on a more nimble and speedy fighter, you could use the MX and the B key to target and hit quite a few bombs without necessarily having to get visual on them and then get the gun over. That's something I'll have to practice. But try viewing it as an alternative to the Stiletto II that can't get shot down. I like it!