You won’t have to remove the mainboard from your system case in order to install the cooler on any of the supported platforms. In case of AMD K8 processors the cooler is fastened with a swing-slip that catches to the standard plastic socket frame. For LGA 775 CPUs you will use retention with standard locks that should be screwed on to the cooler base. The distance from the cooler base to the fan is over 40mm so you will be able to install and remove the cooler easily and quickly.
ASUS Triton 77 seems very compact inside a system case and doesn’t block any of the components in the area around the processor socket. The manual doesn’t suggest any specific cooler positioning for maximum efficiency. Nevertheless, we had it installed with the heatpipes ends facing upwards during the entire test session:
The recommended retail price of this cooling solution is $35, which is actually pretty inexpensive for an ASUS branded solution.