I have the 900D and there are some great things about it for WC, but some big drawbacks. It fits my 480mm radiator very nicely across the top and would accommodate another in the bottom compartment. On the flip side, it required me to drill holes into the aluminum motherboard plate to get the reservoir mounted. It's not wholly necessary if you want to mount the reservoir near the PCI-e slots or possibly in the bottom compartment, though.
The 5.25" bays in the front are the biggest reason I want a different case. They take a large amount of space and aren't really removable. There are some videos on Youtube of people removing them, but they seem to be load-bearing and are riveted in.
The 900D is a case made in 2013 and it shows. It's very dated in a lot of respects, but still very nice to build in. Also, the plastic brackets on the back for cable management break immediately.