Looking at purchasing some cameras and I'm interested in Linked cameras. Is there a major difference between the LF3 and the LZ8, other than resolution (2 v. 1 megapixels)? How about size - the manuals say 4" x 2.5" x 2.8", but more for mounting. Also, can they be connected by Ethernet at a later date, or is that only the older, lower resolution Airsight cameras? One more - Am I reading the user manual correctly that both of these will also connect to the WWAN (Verizon, ATT, etc.)? Last, if you have either of these, would you buy more/again? Thanks.