I used Centerline Interview Consulting. I thought Keith was great. I did Cut-E too. Ultimately, I legitimately felt that the HR portion was comfortable and non-combative. Everyone was very nice throughout the entire process and put nerves at ease as best they could. If you haven't done any interviewing recently, I recommend at least finding the latest ride reports. If you don't have anyone to give you that gouge, then one of the main interview prep companies is sure to offer them up for a price. Emerald and RST are definitely the majority stakeholders from the other guys I talked to in my interview class...can't go wrong there as long as you don't give them scripted/canned responses.
23 AUG invitation email; took assessment 28 Aug, Invited to interview 31 Aug: Called to scheduled on the 1st of September, Interview 23 Sep (CJO!), still awaiting class start.
Cheers!