I’ll add my testimonial.
Dana and I (along with several other GGC members) attended Phase 1 and 2 last weekend. Today, we autocrossed with the PCA. As often happens, it was a re-run of a previous GGC AX course. Using what I learned in Evo school, I knocked over 3 seconds off my previous best time on that course. YMMV.
The Evo school is coming back to the area in November—the same weekend as our chapter’s Thunderhill HPDE, in fact. If you’re not going to attend the latter and are serious about improving your AX chops, I heartily recommend it.