I used Checked and Set for app review. Even though I had a friend who had used their services look over my stuff and make corrections, I still had plenty of stuff they had me correct. I had miscalculated days between two jobs and forgot to add an explanation for the time I was unemployed. Got the email to interview shortly after.
I attended a free seminar through my union with Emerald Coast a few years back so I had plenty of stories prepared. Scheduled a 1 hour top off with them about a week prior to the interview for $100 just for peace of mind and wound up spending about 90-100 minutes on the phone with them.
The interview itself is about as laid back as it can be. Any pressure I felt was definitely put on by me. Smile, relax and be yourself is the best advice I can offer.