Of all the pistol, rifle, shotgun, defensive or competition training I've done, ECQC is the best.
I like the multi disciplined approach (a little bit of; verbal judo, stand up/clinch, ground fighting, knife, and pistol 0-5 feet).
It's not just a shooting class, but a self defense fighting class instead.
The instructor is a first class educator and teacher.
I've only taken a second class from the same instructor a few times (Clint Smith, Pat Rogers, Tom Givens and Bill Jeans being the exceptions), but I've been to ECQC (or its derivatives; VCAST, EWO, and AMIS) about ten times.
I'm going back again in May.
The way that the curriculum evolves and is formated, there is always something new to learn.