It’s at the low end of closed loop systems but it’s very reliable... just don't leave it in a cold room, we had a person post that one had frozen and blown up.
Many people have a resistance to closed loop systems, I did. I used Coolermaster air coolers exclusively for years. But now I have an Antec H2O 620 on my system. Do I need it? No. Do I plan to need it? Yup. If you want one, don’t let anyone talk you out of it.
Installation is difficult for some people. There are several videos on line. Watch a few before you dig in and take your time. I think there is one or maybe two companies that make these things. They all look very similar and have similar mounting systems.