Has anybody used e voucher to swap for multi day tickets is it easy and stress free also cheapest site for these
You have to queue up outside the entrance to exchange them using an exchange machine. I don't know whether the machines have an English option or they are just French. I speak French so I didn't look for one.
It's usually better to buy directly from Disney as they sell tickets that you can print off and scan directly at the entrance with minimum faff. This counts double if you're going off-peak and/or are happy to visit only one of the two parks per day.
I'm inclined to agree with stifle on this one :)
If I buy an online printable ticket, I do it direct from Disney too if FNAC or some supermarket doesn't have a better deal on at the moment. Admittedly that's only happened once, but it's still worth to check :)