[quotemsg=20782865,0,470887]... the whole thing could be a great cooler if they just go with straight edges on the fins that butt up directly to the back of the fan.[/quotemsg]A distance is actually better since it helps the distribution of air between the fins.
A tiny amount of air will probably leave at the gap, but less than you think.
[quotemsg=20785403,0,386624]If I recall black body radiators are the best at transferring heat - white may look pretty but ugly is as ugly does - meaning black would have been a more efficient choice.[/quotemsg]Mixing apples and pears...
* Black body radiators are very efficient, provided they're hot enough. >1,000 degrees on the surface it's great for cooling in a vacuum environment. Our Sun is a prime example of a black body...
* For convectors, which this cooler is, it's best to have no paint at all, since the paint act as an insulator. Black paint is the worst, since it will absorb radiated energy from the surroundings.