The audiologist who did my impressions said if my CIEM's didn't fit to come back and he would redo them free of charge. I would probably have to ship out at my cost and I'm guessing Heir would cover shipping on their end. What worries me is UPS hitting me all over again with duty and fees again. I paid 96 bones in fees and duties to get these little babies. I think I just messed up trying to insert them though. It's going on an hour since I got home from work and they've kept seal so far are still comfortable to wear and the music is sounding pretty good. I'm going to take them to work again tomorrow and try being a little more careful in inserting them from now on.
No DigitalFreak Heir will not cover shipping back to you. In my particular situation I honestly feel they should cover the shipping as it was their mess up and not mine. But for general refits that is a different story. You should not have to worry about paying duties again on the item. That should not be an issue.