Thank you Steven for the very nice feedback! :)
make some happy.
we put a lot of love and work into the materials.
for the legacy, for now I prefer this type of materials with the legacy material which will stay for ever and will not be removed - the Corona team confirmed.
there is no drawback in using it, the physical is only easier to setup in the sense it is less easy possible to make a "non physical" material with it;)
if the legacy is used right it delivers exact the same features and quality for that type of materials PLUS that it still has the reflection color slot which I miss sometimes.
today if i make new libraries i might use the physical for more materials, but i still use both types, depending on the needs, the legacy has overall more control in the reflection, the physical has some nice new features like sheen etc so fabric or SSS related material i for sure make with the physical mat.
so both are good to use, for concrete, i think legacy is best.
cheers
Stefan