When I first saw the PolarFLO Block I was impressed. After taking a closer look at it, and chatting with the man who made it, I was even more impressed. Then I installed it. . . and yes, again, I was even more impressed. A heat drop of 4.8°C when compared to the Maze 2 is a huge improvement when only changing out the waterblock. With performance like this, it's no wonder the PolarFLO is starting to become a household name. If you're in the market for a custom-built water-cooling setup, I highly, highly recommend putting in a PolarFLO.