CaptainRox

Super easy to install, no special tools required (besides a couple of crescent wrenches).

Just remember that the cooler will need to be connected continuously to a water source (i.e. sink), so you are somewhat limited in terms of placement. However, the included supply line (similar to this) is very long and easy to hide. Just make sure you rinse out the plastic-y taste before use.

And of course, Costco's warranty makes the purchase essentially risk-free.

If you have any further questions, feel free to ask. I can send you a picture/diagram of my setup.