Interviewing process was pleasant and professional. First round consisted of two interviews, both roughly 45 minutes with the vast majority (35+ mins) devoted to the case. Review what the definition of profit is and bring your good business sense. If you have that, you'll pass. Second round was the same format except it was on site for the office preferenced and with more senior members of the firm. No tips other than be confident, stay sharp with pencil and paper math (calculating percents, multiplying numbers, etc), and structuring your argument with clearly defined pros and cons of each approach.