My mug showed up (no customs ransom) two months after the x20, unbroken.
I did have to email/ping them about the missing mug.
FWIW, just for those contemplating a build, just because the instrument is completed and your final payment is in, calculate about another 2 weeks before it is actually in UPS hands, and then a week in actual UPS transit. So for a fairly standard build, its about 2 months construction plus 3 weeks thinking about and getting ready to ship+actual transit time. Even then (IME) they only get turned over to UPS late Fridays anyway and sit the weekend in Sligo - if you didn't start tracking on a Friday you sit until the next Friday. If you make the shipping video on Friday you won't actually ship until the next Friday.
Now factor in mug delay
Someone is going to pop up and say their instrument sailed through US customs fine, but the mug hidden in the guitar box was stopped for several hundred in import duties.