Just got an insider peek at the testing system. Right now they are just beta-testing and are on schedule to release in about a week. I saw a few of the questions and they look great...all very clinically oriented with thorough explanations. I like the fact that they reference all of the material too, so you can just turn to the chapter in Miller or Barash if you wanna read more. 250 questions is a little low but they said they will be adding questions in real-time after the site launches at a rate of about 10-20 per week. Since the new exam will only be 250 questions, it does offer the opportunity to take one full-length test. The best thing is that these questions are all written in the new ABA format...clinical cases that make you apply your knowledge base. It also gets you in the habit of taking a computerized test.
The actual testing system is VERY cool. The questions are arranged by topic and exams can be taken accordingly. For example, they let me take a 20 question cardiovascular exam, but I could have chosen any or all topics. Also, the system tracks and charts your performance by exam and by topic so it would tell you if you were weak, in say, Pulmonary physiology.
Hope this helps.