I can't speak for the quality or value of the NVR, but the cameras are a good deal. Here is my review of the version that has a microphone input jack, but is otherwise identical:
https://www.ipcamtalk.com/showthread.php/5058-Got-my-Dahua-4MP-IPC-HDBW4421R-AS-2-8mm
Here is a snapshot from one of those cameras, demonstrating a bit of IR bleeding and a spider web or something in front of the lens. The IR bleeding was a lot worse until I took the dome cover off and tweaked the foam around the lens a bit (then put the dome cover back on). Dome cameras with infrared are very susceptible to IR bleeding but if you are patient and careful you
can eliminate it.