Im currently studying for my step 1, due June 17th. So just out of curiosity I signed up to AMO and they already have some options available for July. Which is a lot sooner than what I expected to get if I scouted on my own. They also say that I do not have to pay until I choose the option I like the most, and that it is completely refundable if I cancel later. I left it at that and want to do what you suggest, which is to get some reference from someone that has used this service.