There have been some recent success stories of interfiling and direct approval of GC recently. Come on people, you have been waiting for 10+ years. Some have been waiting for 15+ or 20+ years. Take a chance. Spend that 2x$400. I would gladly have done it even if there is a 5% chance of this getting through. I had spent enough time thinking about it before I recommend it to my friends here. Don't worry. It is certainly not going to hurt you.
I sincerely wish all you people who did interfiling will share your success here after your GC is approved.