Displacement & mix material, round edges

[mate]

Displacement doesn't seem to work in either a mix material or with rounded edges, is this correct?

[bepeg4d]

in v2.0 the mix material has a specific field for displacement so you can't mix two materials with displacement but you need to mix two different displacement textures in Photoshop or GIMP, and then assign the resulted texture to the mix material only.
ciao beppe