Yeah, I have thoughts on MKSAP actually:
1) MKSAP17 is coming out in two phases - part A (6 books) is released July 31st; part B (5 books) is released Dec. 31st. So all eleven MKSAP17 (the newest) books will be out in not too long a wait. Just be aware of that if you are considering the full MKSAP purchase, because they're really expensive, even if used.
2) I own the eleven-book MKSAP16 collection. Aware about 17 coming out this year, I was OK purchasing 16 just a couple months ago (for various reasons I won't elaborate on here). So the stack of books is sitting in my room. I've made random flips here and there so far, but haven't started reading them for real yet because I'm trying to get through my second pass of the JH book, and until I finish that (maybe in a few weeks' time), I refuse to begin MKSAP.
3) MKSAP is SO WORDY IT'S RIDICULOUS. I don't mean to say that in any negative way, as that statement does not relate to whether they are superfluous per se, but what I can say outright is that if you're the type who likes pictures, diagrams, flowcharts, etc., MKSAP is basically AS FAR away from that as you can get. I'm almost shocked at how they're pretty much just all text and nothing else. Iow, the structure of the books is like a novel. The same way as when you buy an apple it should come with a pack of floss, the MKSAP books should come with a pack of Adderall or Ritalin.
4) Finally, to answer your question: definitely do not use MKSAP for 2CK prep. They're residency level books so will not fit the purpose of the 2CK exam. My perception so far of what "residency level" means is a lot more regarding epidemiology, when to use certain drugs vs others, dosing regimens, non-elaboration of basic sciences (i.e., there's zero mention of MOAs and explanation of micro in the JH book, for instance, but that's a good thing because we know that already, but not good if you're prepping for 2CK where that reinforcement is healthy), more extensive lists of DDx, side-effects, and discussion of less common pathologies in high level of detail.
