If you want to check for yourself how much you could save with TransferWise (or one of their competitors) vs banks or PayPal, we've built a comparison site for international money transfer: www.monito.com which compares live exchange rates and fees for any amount you'd like to transfer between two countries/currencies (e.g. US-Euro https://www.monito.com/send-money/united-states/netherlands/...)
Our initial goal was to help migrants save money when they support family back home, but the tool can be used by businesses/freelancers/travellers as well.
Let me know if I can be of any help in the comments, we've become payment geeks over the years!