I purchased IZI after the new security feature was implemented and used it for the past two days. Reading through the chat in Discord, it seems like people were compensated for the downtime. The setup instructions are rather simple and it only took a few minutes at most. I only played with the ESP on, so I can't speak for the reliability of no recoil/sway.
The ESP itself works flawlessly. For the most part there is no noticeable impact on the framerate; I noticed a bit of a slowdown when I landed in Bootcamp and I had Player, Weapon, and Attachments ESP on, but that is to be expected considering it's a high loot area and a lot of people drop there. There is of course room for improvement, and personally I would love to be able to toggle specific loot so that there is less clutter on-screen.
So far I have had no game crashes or bluescreens or any sort of malfunctions. If they keep this up, I will be buying again once my time is up.