I started reviewing them in these last few days before my exam, and so far what's in those files is what's been on UWorld qbank. Several bullets I looked at and said "DANG - here it is and I missed that one!!!!!"
To be honest I found the stuff in the 100 to be a bit dated. Sure some of it's still relevant but some stuff was just useless info. In my opinion another run through of FA is MUCH more beneficial than a quick skim of the high yields.