The thing I most dislike about heatsinks these days--they all have a "top" cover. I think it looks stupid and it interferes with airflow directly on the board. I have a heatsink tower, meaning that on my IP35-E, the northbridge has less airflow. I have a 36cm side fan on my case--meaning that all air flows directly down to the board. I would personally prefer if those "top covers" were removable, since not many enthusiasts seem to be using after-market heatsinks that have air flowing down.