+1...
When this card was first launched, I thought that we were onto a real winner. The margin b/w XE.com rates and QCash conversion rates were quite reasonable - I was watching the AUD/USD rate closely at the time, and I bought a swag of USD at 90c, when the XE rate was about 91c. Given the way the AUD was falling relative to USD at that time, the 1%(ish) premium seemed very reasonable for the 'insurance' of locking in the rate.
But now that the initial market penetration push has passed, I notice that the conversion margin has bloated out to over 4% (and even more on some currencies). As I write (type...), the XE rate is 78.98, and the QCash rate is 75.07; a margin of about 5%. (Although keep in mind that the QCash appears to be set daily.)
From now on I think that my only use of the card will be for amateur hedging purposes - locking in a rate for some known future need for a currency at a time when I 'feel' that the rate will deteriorate during the intervening time. A punt I know...