transferwise.com - anyone used them?

[Zippee]

Has anyone used transferwise.com to send money abroad? I need to pay a friend in USD and want to ensure I get the best rate/lowest charges possible. This site I’ve seen advertised on the tube but it seems pretty new so just want to ensure all is kosher. Sum is approx. £2800 sterling.

[Zippee]

Thanks both - I'll give them a try.