how helpful are the kaplan step 1 course and course materials. i want to get the lecture notes (set of 8 books) on ebay and am wondering if anyone who did really well on the step 1 would recommend them. if not, what books/materials should i stick with? also, i just finished ms1 and think i want to start studying this summer so that i can take the test early so that i can go on a vacation overseas. is it a good idea to start this early? i figure i would have a load of other stuff to learn during ms2.