Im 0/4 without prep, as I was concise and direct with my answers before prep. I went and did interview prep with 2 different agencies and Im 0/3, post prep. Ive consulted a 3rd and have been told I elaborate too much now. I need to find some common ground. This whole "be yourself" thing isnt always a good guide, especially when youre a technician with a hyperactive analytical mind, like myself. HR is convinced though that we all are 40 hour a week cubicle workers and will continue to try and fit a round peg in a square slot. Id do interview prep again without a doubt, but dont put all your stock in the basket that it will land you the job. I was an introvert before prep, learned how to be an extrovert after prep (for the panel of course), but your mileage may vary.