To begin this review, let me start by saying that this was my first time installing a custom water cooling system. This block was used in conjunction with the XSPC Rasa 750 RS360 water cooling kit. This kit came courtesy of Mark at FrozenCPU.com. Danger Den is a company that has been producing high-end water cooling solutions for many years. It is one of the most respected names in the industry and we will see if these water blocks lives up to that legacy.