I recently installed 16 channel R series NVR. Very impressed with how easy setup was. So far it works flawlessly. Originally installed it with an old 1TB leftover drive. Then changed that one out for a 10TB new one which gives 700 hours (30 days) of recording 4 - 4K cameras. Remote viewing anywhere from iPhone setup incredibly easy and works great. Better than I anticipated. Only suggestion is a little documentation for integration into an existing home network, and manual connection of cameras that are not directly connected to the NVR. FOUR stars!