Agree, I did the seminar with ECIC back in October because they were in town and I had heard good things from other dudes. When I got an interview invite 6 months later, I sent a note to Mary and had a one on one phone session that lasted about an hour and a half. It gave me the confidence and fine tuning I needed to get the job. Great product and well worth the money. If I need them again, I plan on calling on them.
I would say the important thing is to just get some sort of interview prep, whatever the source. Had I gone in there without it, it would not have gone so well.