Industrial Button Study

a while since i posted anything so here goes.
An emergency stop button i found a picture of online. the shape was simple to model but i tried a lot of new things with the rendering setup.
ambient occlusion is multiplied under the lighting pass with the arch and design shader. rather than after as iwe done in the past,
my first crude attempt at a hdri rig was used for lighting and reflections as well as a few physics based lights. not quite happy with the result but i learned a lot.
i also tried a different resolution than my standard 1080p format.
modeled in 3dsmax rendered in mentalray

Update: slight post value adjustment as it was bugging me