Of course Mila you are going to get everyone's thoughts based on who they used.

Never heard if checked and set. I am sure they are very good.

I used emerald coast. I didn't have much time and they have a webinar prep course. 2 days. One day is group work with 7 or 8 applicants the next day was one on one hr prep. I cannot speak on experiences with any other company but I will say this NEVER in my life at the end of an interview has the HR person given me a "thumbs up" as I walked out of the door, but she did at my United Interview. I think any prep is good but Emerald was worth every penny!

Good luck