I have 2 960Ls and bought 3 more for family in 2016. 
Do I need another?  
Yes, you may need another.   

Before, I was using 2x IP camera just to cover same place (e.g. living room).  Now only need 1x 960L
Some great on things on my 960L revA
Can do all these 3 events same time:  SD recording, ftp snapshot, ftp video.
On thing not ok is the length of power cable. too short compared to other dlink cam.