It does get cold, but it also warms up quickly, so I've never really had a problem with it lol. I don't think it was intended to be a practical work station, however, the bottom desk is well thought out because it slides out and can act as a second desk that can be placed anywhere. You can check the site out for examples of what I mean.
I love it though because when not in use, the bottom desk hides underneath the main desk, and the whole thing barely takes any space at all. It was designed to have as minimal of a foot print as possible, which definitely follow's Apple's own design philosophies.
Yea it blends nicely with any mac sitting on it, but on the site, it notes that the metal used is not actually aluminum but another type of metal that gives the very similar appearance of aluminum. Believe me though, it compliments beautifully. Its definitely a work of art as well as just a desk