One important question to always ask them is if there there is anything required besides what you been provided? I checked on my SI once and they told me it was in line to be reviewed. Two weeks later I received a letter asking for additional tests which the gal never mentioned when I had called. So I lost over two weeks because the letter was dated prior to the call date and I could have initiated the tests much earlier. If you use a service I think they have a pretty good handle on everything.