I greatly missed terrain detail textures in the old EVE, so I was eager to try out this pack. I enabled the -force-d3d11 options on my KSP_64.exe shortcut, removed my existing scatterer, RSSVE, EnvironmentVisualEnhancements, DistantObject, and TextureReplacer folders, and installed ETO.
Unfortunately, this caused load times to jump to about 10 - 15 minutes (during which time my computer became inoperable), slashed my framerates in half, and imposed an opaque shell around 70km above the Earth that turned it into a blue, featureless ball. Some performance issues weren't surprising, but I have a GTX 980 Ti, an i5-5960k processor, and 12 Gigabytes of RAM, so I wasn't expecting it to lock up my computer entirely (though admittedly I am running in 4k).
If there are likely to be performance improvements in the future, then I eagerly await those. Otherwise, I'm probably going to have to stick with RSSVE.
EDIT: As to the featureless sphere problem, I learnt that his was probably due to the change to DirectX 11. RSSVE comes with a fix for this in the form of a scatterer config, but I don't know if there is an equivalent for this mod. Regardless, the other issues unfortunately mean that I won't be able to use it for now.