I've been using this reservoir for approaching 3 years now, and it's been fantastic. Very unique look and the aRGB integrates easily with your system. People always recommend D5 pumps over DDC because DDC's are louder and aren't cooled by the water flowing through, but this pump has been very quiet and it's been running flawlessly with Bykski's big "Armor" heatsink. I definitely recommend mounting it by a radiator, though, so heatsink does get some airflow. Haven't had any issues pushing plenty of flow through a chonky 420 and a 280 rad with a cpu & gpu block. And it's PWM so I can control it through my Aquacomputer controller, which is another plus since a lot of D5's aren't PWM.
Only negative I'd say is that the bottom port is listed as an inlet, but that's a little finnicky. Trying to fill up the loop in that configuration ends up starving the pump and it makes unhappy noises, so I just switched to the upper side inlet instead. Really that might demerit half a star, but since you can't do half-stars on here I'll leave it at 5 stars, since it's been excellent otherwise.