I used Uworld mostly. Did it over 2 times, and reviewed the tables and charts another time. I read through MTB2, 3 and MTB IM but didn't find them super helpful. I was consistently scoring low in OB/GYN so I read that section another time from MTB2/3 (don't remember which one) and step 2 secrets. I also read through Pestana notes very quickly. I did all the NBMEs and CMS (and I'm certain I came across a couple of very similar questions on the real deal) and used Uptodate to look for answers and explanations to NBME questions or if there was something confusing or inconsistent in Uworld.
Overall, my prep for 2CK was much more haphazard compared to step 1. I had to take a lot of time out for my family and exams at my med school. The worst part was that I was consistently scoring low on NBMEs. But I decided to give it all in the last 10 days and go ahead with the exam. I got a 265 in the UWSA 2 days before my exam so that was a relief.
The exam itself was fairly reasonable. No extremely long stems, felt similar to Uworld in length and difficulty. I felt that certain blocks tested more heavily on certain subjects. It started off medicine+peads heavy with increasing emphasize on surgery mid-way and lots (and lots and lots) of OB/GYN towards the end. I don't think any of the review resources prepared me well for OB/GYN but that's prolly because I was weak at it from the beginning.
I was fairly composed during the exam (compared to step 1). I didn't need to take too many breaks either. I had planned on taking a short break after each block but I ended up doing 2 blocks, 5 mins break, 2 blocks, 10 mins break and then a short break after each block. My computer had some issue with audio so I had to spend 7-8 minutes during the tutorial testing and fixing the sound problems.
If anyone has any questions, I'd be happy to help. Best of luck to everyone studying. Just keep at it, it will all work out in the end.