Depends how you use it I suppose. All the supermarkets, petrol stations and hotels accept it, as well as a load of on-line retailers and of course the Amex.
I usually manage to rack up over a grand per month on my Amex card and only have to use a mastercard for perhaps a hundred or two, so it...
Having looked again I think your right, :tantrum:. Oh well it was a nice thought. I see that it says on-line transactions are excluded as well so the best I can hope for is £5 if I top up at the Amex. Thought it must be too good to be true.
I haven't tried this yet but unless I'm mistaken can I just add £10 a day to my e-cash card using my Amex CC for 10 days and therefore get a £50 credit. Add in the 10% discount you get when using the card and even the 200 nectar points I get when topping up, (worth another £1), I'm getting £100...