This deal is not for everyone and it is not the only Travel card on the market, but it is a very useful way of getting the best exchange rate if you are buying from an American website and dont want to get hit with transaction fees and lousy exchange rates from your normal credit card company.
Travel cards work by you loading money onto them before you set off (either in $ or Euro) and it then reduces down every time you use the card but you pay NO transaction fee for using them except at ATM's ($2). If you can afford to tie the money up in advance and buy when the rate is good you will get the best advantage.
If you look at FairFX's daily exchange rate it is always much higher than a bank's.
Now there has been a terrific deal floating around this week for plane tickets to America and I have just booked flights for next year but I paid for them using this card and transferring the money I needed from my bank account first at $1.81/£ (you have to wait 2 hrs for the funds to be available) but my UK credit card company are using an exchange rate around $1.7/£ at the moment.
We just returned from a holiday in USA, (courtesy of a British Airways deal via Expedia from HUKD @ £279 return - and we even had an upgrade to Business Class!!) and I used this card for all my purchases/restaurants/cash withdrawls having loaded it when the rate was $2.050/£ and it worked flawlessly.
There's also £8.20 Quidco just for signing up.
Matalan have a promotion where you can get the card without paying the initial fee.http://www.fairfx.com/travelcards