My Dahua NVR died and so I bought a POE switch and hooked the cameras up to my Synology NAS. It only supports 2 cameras for free so I purchased a 4 pack camera license for Synology Surveillance at this site which was cheaper than buying from my local store. Positive reviews from other buyers convinced me it would be fine and no problems at all. A hassle free experience.
Strengths
Easy to purchase Synology licenses and immediate email delivery.