I took and passed the PE (WR&E depth) in Oct 2012 using the CERM as my primary reference for both the a.m. & p.m. While it served my purposes well enough, I would not recommend the PPI's other materials. My general criticisms are:
- They cover way too broad of a base of topics (too comprehensive) rather than following the lead of the NCEES syllabi. Even the CERM (the one product of theirs I actually rate favorably) is half full of material that is of absolutely no use for someone taking the exam, regardless of p.m. depth. Erring on the side of being more comprehensive is one thing, but providing an overabundance of information and then having the reader sort out what is/isn't important for the exam is doing a disservice.
- Their practice problems are generally an order of magnitude more difficult and/or time consuming that what you'll see on the exam. If you know this going in, working these problems can be quite beneficial. I worked several sets of from the CERM's companion practice problems before even cracking the NCEES sample exam, and at first I so was astounded at how relatively easy the sample problems were that I had to ask here on EB whether they were in fact representative of the actually difficulty exam questions. For example, on the actual exam they'll never ask you to look up the temp.-dependent viscosity of water and the relative roughness of an 8" schedule-40 cast iron pipe just so you can calculate the Reynolds number, and from that, the friction factor f; just to pass go and start computing the friction loss. 9 times out of 10 they'll simply give you a value of f; the other 1 of 10 they might have you look it up on a Moody diagram.
- I took one of PPI's guided study programs (a week-to-week study schedule, access to a user forum where professionals and other test takers could discuss topics & questions), and apart the materials included in the cost (CERM) I found it to be a complete waste of time & $$. Had I followed that schedule I would have agonized over several structural chapters with zero relevance to the a.m. portion, and more egregiously, NOT covered the one chapter most important to navigating the a.m. structural.