Do not forget to check the status every couple of days: there will be an extra small charge that you may miss if you wait for a notification in a passive mode. Just the way the business works. They are honest, but you have to be active until you get the final [shipment] announcement.
Otherwise they will wait for the extra tiny payment, and you will wait for the goods... until you discover all this.
To recap: the first payment is the 'estimate payment', followed by the 'adjustment payment' for the actual weight, dimensions and currency rate differential.
At least, this was the case both times I purchased from them.