Seeing that MBP isn't built like most PCs, there's no vents on the bottom. So the fans in the laptop cooler really is just blowing air into a metal wall, which offers minimal cooling for the internal components.
So, the only other way to cool the damn thing would be heat transfer. The problem? Look on the bottom. 4 rubber feet elevates the MBP. Air is a poor thermal conductor, as is the rubber , so thermal transfer from the MBP to the metal laptop cooler is minimal. All it does it heat up the air around it, which then heats up the metal cooler. There's some effect of cooling, since the cooler will cool down faster than the air underneath it, but it's nothing worth noting.
In short, MBP is a very poor candidate for a laptop cooler. However, what it does do is help protect it vs liquid spills or whatever though!
To lower temps, you can try a repaste of the thermal application. All retailers (not just apple) underpay people and they all do a crappy job of it. Might drop it 2-10 degrees this way, depending on how good you are/how bad the initial person was.
You can also crank up the fans.
Eh, it doesn't really matter.
