I have been the unfortunate one who has taken 3 different ones ,so here is My opinion about them. Ho I took the must know cases.here u take abunch of exams with a partner at the course, who may not really challenge you ,as a board examiner does.so this was not useful.Ho teaches one or two cases and then briefly goes over the answers of the stems. Jensen He swears that Big Red is the whole and sole and will get u through.It is a good summary of what u need to know but,some material is outdated.His case stems are somewhat close to the real deal. Board stiff This is an expensive one.I liked it initially but by the end of the long day,it seemde like the the same tips were given over and over again.Also they make u feel u can say some things on the exam and get away with that,but do not do that! I do not recommend this one. The real exam Very tough stems with many co morbities and complicating scenarios.You have only 30 mins to prove yourself!! Preg,trauma,smoke inhalation all together and then complications like arrest,delivery,fetal brady etc etc... So the best advice is study hard on your own and practice with someome who will challenge u well. You have be very concise and organized in your answers!