Pretty crappy, actually. And I'm a pretty big Star Trek purist. Actually, it sort of depends on the shot. There are some scenes I find that look okay, but most of the Ent stock shots are overly grainy and make for a jarring viewing experience when seen side by side against the crystal clear principle photography. There is one original FX shot off the top of my head that I think looks much better than the new FX shot (from "Galileo Seven," when the shuttle launches; the old effect, sans wobbly starfield, looks much better to me than the new shot, which could be a scene from a Star Trek video game). Most of the matte shots hold up pretty well.