I had the same questions and I paid for the service. It's not worth it in my opinion. It's too slow, 10+ days start to finish.
I had vocational courses with science-like titles that had no pre-requisites and I didn't know how to categorize them. 3 transcripts. I paid for service and then about 3 days later my courses were entered for me.
I get the idea that the person that added my coursework had no more of a clue than I did. I approved the grades thinking it's all on them since they did it and not me. Well, it then went to a verification process and I had no say in how they categorized it and they changed things around after I approved the entries, but it was a done deal.