This looks good, but just so we're clear:

This is NOT actual displacement, just bump, or did you subdivide the model several times?

I'm also curious what exact GPU you are using to get render times down to 5sec?

Have the "Fireflies" been removed with a filter or are you're settings high enough to remove them?

I'd also be interrested to see an OpenGL preview.

It seems the OpenGL preview actually changes, depending on what render engine (Firefly/Superfly) is used.

I think you need to render at least once to see the effect.

Thanks!