I like it very much!
There's only one thing which puzzled me for a moment:
For filtering by keywords, you put the condition screenshot directly above the exception screenshot, so that I thought it was the condition screenshot after the addition of the keyword-condition and wondered why the button for the keyword condition wasn't selected.
Aside from that it's very clear to me, but I've been using Phex for a few years now, so you might need to ask some newcomer (or just someone who never used Phex before), to get a second opinion
For tuning, you could add some chapter titles to give the guide a bit more structure.
Besides: I just also added your walkthrough at the description of the search screen:
http://www.phex.org/wiki/index.php/F...ialog#See_also