Here is the general impression I got from the GPEN exam.  First off I want to say the GPEN exam was much better then the CEH exam.  Let me explain quickly why I say that.  After I got done and while I was taking the CEH exam I kept seeing questions in which I disagreed with the 'correct' answer.  I knew which answer the EC-Council wanted but there were at least 10-15 questions that I believe (and usually the CEH course ware backed me up on this) didn't have a correct answer.  That really annoyed me.  The GPEN didn't have anything like that even the questions I got wrong, and there were quite a few , I could see why I was wrong.  OK, enough of that rant. 

The next thing I want to say about this exam (and I presume the class also) is it is much more focused then CEH.  I know I keep comparing to CEH and I am not meaning to disparage it but most people on this forum are familiar with it so it is an easy comparison.  Instead of going over all of the available tools it picks on the most popular/best tools in the trade and goes into how to use those tools to achieve the best results.  I was also very happy and impressed that a lot of pentesting methodology information came up.  This made even the exam seem a lot more professional and less of a 'hacker' cert.  Probably the biggest surprise I received taking the test was the difficulty of the exam.  I was honestly scared to death of this test.  With all the top level names that are attached to the class and with the high level of technical content that the class is stressing I figured the exam was going to be "Ed Skoudis Genius Level Hard".  Which is way above me .  I was pleasantly surprised to find out that while it was highly technical it wasn't beyond what a typical experienced pentester would know. 

That's about all I have.  I will mention the practice tests were great and while they weren't the actual test questions they gave you a good feel for what to expect.  I do want to caveat the above review with the fact that I didn't take the SAN training, even though I really wanted to, so I have no idea what that is like this is strictly my impression of the exam/practice test.  I highly recommend this exam or training for any CEH or pentester.