Usually works fine. Newish version AI files, opened or placed in Illy and converted to pdf's are usually good to go in my CorelDRAW X6. (Unconverted text apparently benefits from "Placing")
Only complication is many times, previously grouped objects are now ungrouped. If I don't need to manipulate objects, I just "Select All" and Group.
Both Steve and a local buddy have done this for me when needed with success.