Hey...
I don't know how much help this will be but...
I am still relatively new to D&D and I found the Star Wars D20 very easy to learn, and the D20 rules seemed to be pretty easy to follow. My group is putting or FR campaign on pause for a while and playing Star Wars. We did a one shot with some characters the DM made up for us. I can honestly say that it was very easy to understand my character (I was a 4th level human scoundrel, which is pretty similiar to a rogue in D&D).
I don't really have the details, as it's been a month or so since played the one shot. In a few weeks we switch over and play SW as our main game. But here's what I recall from the one shot...
The game was fun and I felt that it involved a lot more PCs working together, since it takes more than one person to handle the big ships. For instance, I was manning weapons that when they hit disabled the enemy ships internal systems making them unable to move or fire. One guy was piloting the ship I was in. The other passenger in the ship was rolling for computer skill checks which , if he made it, added , I think, a +2 to my attack rolls. The other ship had a pilot and a guy who fired for damage to the otehr ships which could destroy them. He also fired missiles , which, in a rather amusing turn of events ended up backfiring when after all the targets were destroyed, one remaining missile locked onto his ship and he actually got a critical hit on himself...
It was a little confusing keeping track of the ships stats, but overall, not much different than keeping track of a PCs stats.
You also deal out more damage with a missile than say, with a sword in D&D, so there is more rolling involved.
It was different, as the setting is obviously vastly different from the FR which I'm used to, but really fun and easy and the D20 stuff struck me as very similiar to D&D.
I wish I could remember more from the one shot. I'll probably post more about it when we start the long term campaign.
Have fun.