I did SOPE for the April 2017 exam, then EET WRE Depth for the Oct 2017 Exam. EET's WRE depth course is far superior. Hands down. The EET binder is also in order of the test specifications - making it quicker and easier to find the info you're looking for. The EET binder includes equation sheets at the beginning of each section, too. So, you don't have to dig through piles of pages to find the equation you're looking for. SOPE's course materials weren't as organized and some of the equations were scattered in the notes. SOPE also references the CERM a lot and tells you to go there for further study (instead of just reviewing the material). I found that pretty annoying. Anyway, I highly recommend EET's WRE Depth review!!