I had been playing the game since Launch with my XIM4 and now XIM APEX for a month.
The game felt pretty close to PC, with XIM, SWBF 2015 was the best.
The Aim Assist is quite strong on this game, I was fighting against it with XIM4, I have to use curves but still very good.
XIM Apex was a nice upgrade, the 1000Hz polling rate breaks the AA bubble easier, is not a hindrance, no curve needed to get out of the bubble because of that, no acceleration.
1000Hz polling rate, sync = Default is the easier to break AA, it feels like the SWB2015
1000Hz polling rate, sync = Common (needs smoothing) felts a more magnetic AA
500Hz polling rate, sync = Common, no AA is PC like (my favorite setup)