Conversely, I've used them on many, many occasions over a number of years - not for the sums you're talking about although as much as a few thousand AU$ and never had so much as a problem. I'd still use them.
+1 that is my anecdotal experience also, started living between uk and us, conducted many international transfers over 5 years with no issue, was having a much harder/more expensive time with other services (I think mostly paypal) before that.