Sucks big time.
While they can be professional and lighting-fast on delivery, at the same time they´re highly unreliable service with unconstant results.
I live in spain and they had made me lots of ******* things, like reown the packet ( that means that the packet never arrives ), deliver an empty box, and even (its funny) stole only one part of the content ( In example, i have been stolen some of the CDs one guy sent me. The postal worker opened the packet and selected the CDs he want, leaving there the ones he dislike!

)
A friend that works on the postal service told me that its even more common on international shipments.
Conclusion. Avoid it while possible.