What our your opinion considering render time, is it worth it to use V3?
Going through and doing some tests, I'm not sure the prepass and render times are really worth a v3 total overcast.
However what I did find is you can use a v2 for the main hazy overcast, and than use a v3 cloud layer that isn't as dense; contrast 0.5 coverage 0.25 to create some nice v3 "accents" for your total coverage overcast.