Hi Neway
Any updates in your case?, yes all the lawyers say that, but I call anyway...
My Oath was really good, and yes, the Oath letter that they send you, there is a questionary on the back of the page and one of the questions is "Did you leave the country after your interview", so I was glad that I didn't it... The cerimony was way better that I thought, I was there at 7 and finished at 10 with pictures and everything, went direct to the Passaport agency and got mine in just 2 days..., I'm really glad that it's done already, my case took 6 months...
I hope that you can finish yours soon too, I know how hard is to be sitting just waiting and waiting..., but in the end, it worth it...
My best wishes for you