Has anyone used the services of TMS travel money services,can I trust them?

Has anyone here used TMS to exchange their travel money? I am a little nervous of buying online. Can you tell me if the money arrived ok and on time please? They are based in Hayle Cornwall and seem to have the best rates. Also if anyone thinks the Australian dollar exchange rate may improve in the near future?
The reason I want to use TMS are because the rates are the best I have seen.

The safest and most convenient way is to use the money exchange at the airport.