Hi all I am deciding to purchase either 5500NAC or 5500SHAC and wondering is the NAC worth the extra $. The 5500SHAC has 8 visualizations is that enough ? and are these 8 devices or are they 8 simultaneous connections. Or are they 8 profiles that can be shared. If someone can share some light on this as I dont see too much information. Also if anyone can PM me to what are the realistic prices for the units Thanks in advance