Turn rollback ramifications

[sansanjuan]

We are considering rolling back a turn on llamaserver. I've been through a rollback on another game with no ill effects but thought I'd ask if anyone has a feel for issue likelihood and seriousness. I understand (maybe incorrectly) that unit ids can sometimes get messed up with troubling consequences. Anyone know if this happens to occur once in a blue moon or much more often? If it is potential big trouble we can perhaps comp the affected player in another way.
-ssj