Long thread about this subject here:
http://www.1addicts.com/forums/showthread.php?t=1132696
I wouldn't put anything cloud related at all tied to home security. So Nest and Google can shove it.
While the information is dated now, this is a really good site to learn about different aspects of IP cameras:
http://www.networkcameracritic.com/
This site convinced me the Hikvision cameras were the right choice.