Im using usmle rx and have been pleased so far. Its a nice touch when they cross reference first aid at the botton and hell, how can you go wrong with $59US/month? the only downside is that its a new company and so they have some bugs to work out. More than one occaision my test has crashed on question 48, but luckily my answers were still there when i logged back on. According to IT, they said DONT use firefox.