One problem I had was that my package (2x T3.6) was declared with a value of $55, but I had paid $55 + $5 for international shipping. In Switzerland import duties/VAT are calculated from the value of the goods and the shipping costs. Because there was no information about shipping costs outside of the package, the customs did some guesswork and added $9 for shipping. For packages with a lower value than $62 I don't have to pay VAT. But now with the total of $55 + $9= $64, the value of my package is higher than $62 and I have to pay VAT ($6) + handling fee($18) = $24.
I can't prove the shipping costs, because the included "Commercial Invoice" shows "Total $55", the customs declaration on the package shows "Total $55", kickstarter shows $60 but not why they have added $5 to the $55 reward and the credit card shows "Total $60".