While not directly related to Star Wars, this blog post by campaign member Damon does a good job of why our gaming group ended up playing Saga Edition instead of D&D 4th Edition. Not every Blackrazor agreed with him, but I’d say he speaks for about half the group, and I think even those of us who liked 4E agree with at least some of what he says here.
A while back I posted a Nuketown write-up on converting Dungeons & Dragons 4th Edition monsters t0 Star Wars: Saga Edition. I did this for Chapter #4: To the Emerald Cliffs, morphing 4E stirges into to Zebulon Swamp Bats. It worked out well enough, but honestly it takes about as much time to make a monster using the beast creation rules in the Saga Edition core rule book.
I think this is still a good GM tactic to troll through the 4E books looking for monsters, but I think it’s easier those as inspiration and build your own creature than it is to try and do a conversion.