Ordered 5 ADR1000AHZ just to see, how it is going.
Will report back, when they'll arrive.

Edit:
Yes, I had to give a VAT. Because I have registered a (very) small business, I could enter a VAT here.
It also looks like the ADR1000AHZ falls under certain export restrictions. They had to answer some questions, such as where they want to use it (weapons, nuclear applications, etc.) or if they want to export it further.
Edit 2:
Here is a screenshot of those questions being asked:

You'll often get asked all this when buying from the US, even if the item isn't explicitly export controlled because:
(1) The penalties for letting someone/something slip through the net are quite severe for the seller and this is actively and (over-)zealously enforced (basically they can't afford to make a mistake, so they vet everything to be on the safe side)
(2) There are export embargoes of all goods, not just export controlled, to a long list of banned people, countries and organisations. Basically, the US have a long list of enemies that their people aren't allowed to do any business with. Most countries have similar (usually much shorter) lists but nobody else seems to be quite so gung-ho or bureaucratic about enforcement. Probably one of the reasons that many small US vendors won't export (think eBay sales and the like), their own government makes exporting a paperwork nightmare. To give you a flavour, there are 140 occurrences of organisations with GMBH in their name that are currently on the sanctioned entities list (the "SDN list"), so someone can't just go "
They're in Germany, therefore they must be OK".
In theory all US businesses doing business with the rest of the world ought to be asking
who you are and
where the goods are ending up no matter what they are selling, but in practice it's the industries with ITAR controlled or dual-use products who are 'hot' on the topic for obvious reasons.