This is my second water cooling build. I bought this to replace two separate AIOs, a 240mm CPU AIO and a 360mm GPU AIO, in my Corsair 4000X (exactly same as 4000D and 4000D airflow except front is glass). First impression was it was well built and installed easily enough into the case.
Building was a nightmare. First off, it blocks half of my SATA ports on my motherboard. There's a port on the back which would be neat for a drain port, but adding anything to it aside from a temperature probe would make it so you can't close the rear panel. The radiator to reservoir connection point is too close to the radiator, making it impossible for me to fit a 14mm OD hardline tube bent at 90 degrees between the two. I ended up doing a bunch of crazy 90 degree fittings and U turn bends to fit it. The location of the fill port is too deep into the case to reach into to put a stop plug onto, or even to reach a fill bottle to. I added a 90 degree fitting and filled it through the grate in the top of the case (very slow and splashing liquid everywhere).
Turned it on and the DDC pump is loud. Much louder than my Corsair D5 in my previous build. From looking into it, it seems this is just how DDC pumps sound, especially when attached to acrylic distros and thus having no dampening. It's not great.
I was between giving this a 2 and a 3. It technically does what it is supposed to, which is fit a distro plate into a Corsair 4000 case. However, everything about working with it, planning a loop around it, and filling/draining it, makes me feel like this product exists only to check the box without being user friendly in the slightest. I wouldn't recommend it.