I have this case for the Macbook and would also recommend it. I haven't used it while in the case though as I was also a little worried of it overheating. It is a very good looking case (Mine is black) and offers good protection while remaining quite "slim" and not adding too much to the size.
I'm not sure about the MBP version but if the macbook was sat in this while in use it would block the vent.
When u put MBP in the case and open the lip, the air vent is locaed between back of keyboard and LCD screen, so airflow will go upwards. also, there are four pads on the bottom of the case, leaving some space for airflow when you put MBP in the case. Such design can prevent overheating to some extent. Of coz if you use MBP for more than 2 hours, it is better to take it out of the case.