The cons are the following:

1) I do not trust Chinese PoE switches for anything more than 8 ports. 8 cameras is the maximum we would do but still I do not beileve the switch power supply will last as long as small Cisco switch

2) Camera access as above but it is minor since you can still configure the cameras from the NVR

3) Integration with control systems is harder but I think dome drivers do work? Have not tested this since when we will integrate cctv with the control system we just use a "normal" nvr and separate poe switch.