I personally felt like the most recent CBSE was definitely challenging.
I don't think anyone comes out of the CBSE (or Step 1) thinking that it wasn't challenging. Actually, I remember one dude who said "it wasn't too bad" after the CBSE and scored a 44. So I guess that emphasizes that difficulty is relative.
Can someone elaborate on how the CBSE for OMFS is different from the current USMLE step 1?
I think someone mentioned that the CBSE for OMFS is a very old version of USMLE step 1 and therefore it is not similar to the current style of USMLE step 1.
Keep in mind that many medical schools recommend, or even require, 2nd year med students to take the CBSE as a preparation tool for the Step 1. The CBSE has been around for a while, long before OMFS required it as a part of the application process.
Vignette-style questions: I wouldn't say its that different in terms of sheer difficulty. You still have the vignette style questions where you have to pick through pertinent information/labs. I'd best describe the Step 1 questions as
UWorld on 'roids. I did tend to find myself stuck between two answer options a lot more during the Step 1, but that's probably just recency bias.
Language: I do tend to find a difference between the language used on the NBME (Shelf exams, CBSE), Step1 vs UWorld. Not a game-changer, but just
different.
Interface: The computer interface is similar. The Step 1 interface is a bit different than the NBME, but more similar to UW than the NBME. Keep in mind that the Step 1 will have those questions where you have to move a little stethoscope around a chest to identify murmurs. I cant recall if the CBSE had this. UW does not have those types of questions, at least not when I did them.
Length: The biggest difference is the length, obviously. One requires considerable stamina to drudge through those 7 blocks/280q. Totally normal to exit the prometric site and be certain you failed. Drive home safe.
There was a 2.5 year gap between when I took the CBSE and the Step 1. I did worse on the Step 1 comparatively (as I expected), but my CBSE score was still around the same area when you look at the score conversion. Same goes for my co-residents. So I guess its a decent predictor?
Hope that was somewhat useful, but I'm sure most of you already knew the majority of it.