It's a bit too metallic looking, if you're going for plastic. You should have the reflection set to 0%, fresnel reflection can be somewhere around 60-80%, with specular around 5% and roughness set to taste. Also most plastics (especially injection nylon) require SSS. I find in Modo, the best way to get a nice effect is set diffuse low (sometimes to 0%) and just rely on the SSS value, color, and depth settings. Use Front Weighting to help compensate for lack of backlighting... keep those tests coming!
jonah