I agree with Scott, it's more professional to do it in camera, although sometimes it could be painful.
To complement the above comments I would suggest avoiding the blue light (daylight) hitting the right side of the steel parts.
It could be intentional but I think it contaminates the very clean otherwise. Just desaturating the blue would be enough.
In my opinion, it is only the end results that matters to the viewer. With all of the tools digital provides, I don't see why one method is more professional than another, unless, as Scott points out, you need to show an on-site client something that is pretty close to the finished result. Techniques such as Scott uses work fine for his style, clientele and temperment, but I would not want to be limited to just "getting it right" in camera when digital offers so many additional creative and problem-solving opportunities. In the end, though, what I still prefer above all is great ambient lighting, often just daylight. I just dont think you can beat the sun as a light source.
As for the blue reflections in Scott's photo, I like them because I think they provide a bit of color contrast. Nothing wrong with blue color casts, in my opinion, if used appropriately to suggest blue sky reflections or twilight.
Kind of curious, these days, for still photography, how many are correcting mixed lighting at the source, as opposed to later on in post?