US ETFs provide substantial liquidity and access to high-growth industries for foreign investors, making them advantageous long-term growth investments. But they usually have to pay foreign exchange costs for conversions and pay US dividend withholding taxes, which can be as low as 30%, according to tax treaties.
So as an international investor, you have to be fully aware of the US estate tax system for large portfolios. So for the long term, they are attractive if you can digest these factors.