Like others have said, you will have to wait til SW comes out to really make a fair comparison. But damn DI is fun!
I played DI at Allentown and was very impressed. I didn't like the theme, but it won me over quickly. It was by far the most fun "new" game at the show (comparing to Aerosmith, Aliens, and Houdini). The game flows like butter. It's just super fun. And I actually like the mode where it takes pictures of the player. I thought it was funny. I could see it really being a hit with kids. I was with a group and all of use loved DI. If I had the cash and had to choose a new game, DI would be it.