The only way a cooling pad might hurt your laptop is if it blows air in the opposite direction of your laptop's airflow. i.e. if the cooling pad sucks air from under the laptop, and blows it out the back of the pad, and your laptop has its air intake on the bottom, then the cooling pad will be working against the laptop's airflow. So here's what to evaluate:
-Look at your laptop's cooling system. Does it blow air out the bottom or out the back?
-If it blows air out the back, you want a cooling pad that blows air upward. I highly recommend the Coolermaster Notepal
for this, because it also tilts the laptop at a pleasing angle and dissipates heat through its metal structure.
-If it blows air downward, you want a cooling pad that sucks air out the bottom and out the back of the pad.