I still don't have a complete picture but it seems decent. I deducted one star because with my previous CoolerMaster Master Liquid 240 Lite water cooler I had idle temperatures around 30°C, while with the DeepCool I'm around 35°C. However, these extra degrees are offset by the wonderful IPS screen that can display images, gifs, videos, or system information. The two-in-one cable for the fans is convenient. Time will show its durability and capabilities.
Update: I suspect that the higher temperatures I see for the processor might be coming from the power supply, which in my case is located high up and right behind the motherboard and processor, so the power supply's temperature might be affecting the processor's temperature, even though the previous water cooler was in the same case! If this scenario is not the case (which would mean the CoolerMaster was superior in cooling), then maybe it's coming from the IPS screen of the water cooler.