While some reviews comment on bugs or lag, I for one have not encountered anything meaningful or even noticeable. Maps are all well designed, hitboxes are flush, mechanics work as intended. However, this might come at the requirement of a powerful system, so be cautious.
I do believe the developers are also quite active, consistently ironing out bugs and fixing performance whilst adding new features.
Absolutely phenomenal experience, one of the best tactical shooters on the market. A worthy addition to the Red Orchestra collection of games. I do admit at times the game feels less "alive" than RO2, however the improved technology of the game is welcome.