WS-1200-IP, I had the 1001 first, but I could not get the Wireless to work. It would connect to my network, but never get an IP. This one did the same, and I found they are harcoding 192.x IP's into these devices, even though they are set for DHCP. My network uses 10.x IP addresses.
They are functionally identical, just the data gets sent to the ObserverIP module instead of directly from the display like the 1001.