I purchased two Grandstream GXV3674 HD VF IP cameras to replace two that had started to cause problems. These cameras were easy to install on the Synology Surveillance System and worked first time. Initial, general and network setup was very easy once logged on to the cameras web interface. I used the Grandstream discovery software tool which detected the cameras which then enabled me to log into the web interface. Purchase and delivery was very easy, I was kept informed of the delivery with a one hour time slot given on the day of delivery. 5 stars to the sales team.