I didn't even knew they had an express service. But after today I wouldn't recommend it.
It's just 12€ I have to pay, so it's ok. But overall it makes zhe CDs even more expensive. CDJapan marks the package as a gift if you choose that option. But since they also have to write the value of the items included on the outside and it's more than 60€, I have to pay custom tax nonetheless. If the value would be under 30€ I think, I wouldn't have to pay anything.
Edit: oh I just saw I need to make a new thread. I will make one later after I'm home again.