FireCracker Full Length Exams

Has anyone used these/can they comment on their efficacy? Currently they have 2 full length USMLE STEP I simulations available. I bought firecracker after some rave reviews from my classmates, but so far am not impressed. Wanted to see if people suggest doing these exams, or if it'd be better to prioritize NBME's. Thanks! PS - first post in the STEP I forum. Time moves too fast
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums