Update:  I just purchased this addon tonight and have played with it for an hour or so.  I'm still getting used to how to use it properly, although it is very easy to use out of the box.  There aren't many settings if you choose the presets, but there are still many things you can tweak by hand if you wish (which is what I've been doing).  So far, it's definitely handling large, complex scenes far better than anything else I've tried so far.  I'll show some examples when I get a chance, but since I'm trying to use it for animation purposes I'd like to render an animation with it before I show anything.  However, I also have K-Cycles, and so far this plugin has been able to render a 4k scene with heavy volumetrics and adaptive displacement in roughly half the time of K-Cycles, and triple as fast as vanilla Cycles, with better detail than using Optix denoiser.

One thing I would like to point out is that this is an actual ADDON, not a separate build like I originally suspected.  K-Cycles and E-Cycles are separate builds.  This is just an addon that you would install like any other addon to your existing build of Blender.  It uses a nifty node-cache system for composite nodes, so if you use process heavy nodes in composite, such as lens effects, this will cache the node results and reduce the render expense of such processing.   There are definitely some clever things going on.  My concern is animation, so the jury is still out on that until I can render a full animation with it, but for still images, it seems to be very fast and the results are extremely impressive.

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