If you are from outside Europe, this is a great place to shop as there are many European brands which are more difficult to find and more expensive outside the EU. Add the fact that you get VAT back for purchases more than 75€ at a single shop, means things a cheaper by about another 10%.
The only is sure is that it is very crowded. There are shuttle buses which leave from Vienna every hour or 2 depending on the day but they are always long queues getting there and even worse coming back. Wait for the bus at the queue at least half an hour before your planned trip. There a queues at the Global Blue refunds kiosk and at most food outlets as well so plan to spend more time than expected.
Many of the shopkeepers do not speak English and are a bit rushed to offer good service, because of the crowds. I would recommend going there only if you know what to buy. It's not ideal for a leisurely shopping trip. There were areas of advertised free wifi which could not really be connected to.
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