We've had GST for years in New Zealand and it hasn't killed us. Of course, it was scary when they implemented it... but it was a trifling matter to work out an extra 10% in one's head, so we accepted it and moved on.

...except that taxing us 10% on every single thing we bought or paid for wasn't enough, so it has been increased to 11.25%. I can add that tax on to a price with a bit of mental contortion, but I'm damned if I can work out the original prices in my head (why would I? I'll have to pay the GST anyway...).

However I maintain that ideologically, being taxed on money received, taxed again on money spent and älso taxed on money kept aside, is not the mark of a free and equitable society.