The fee varies depending on currency. For EUR to USD transfers, it is 0.5% over the mid-market rate.
So .5% over the mid-market rate equals nearly 1% it seems. According to the Transferwise website, if I send US$10,000 to Europe, the fee is $84.41. I'm quite sure that my bank doesn't charge anywhere near that much. You have to look at the exchange rate of course, but I'm not sure that Transferwise is wise for 4 or 5 figure transfers. Or am I missing something?