I am a May 2017 applicant, I live in Toronto and my office is Missisauga. I haven't got test invitation. I ordered my GCMS notes and what I saw they are doing security check. May be we are late in getting test invites but after that I think it will be over soon. Unlike other applicants who got their test invites soon but still stuck after that on decision made or oaths..
Two main check you need to pass are security and prohibitions. Rest of the checks like knowledge, residence, intent to stay, etc are easy to pass. I saw some applicants on this forum who are stuck at decision made due to prohibitions not passed and even after 5 months no OAth. Prohibitions is the strickest check to pass