I’m very impressed with this card, following our trip last week. Very easy to add funds, and the iPhone app is perfect for tracking your purchases. It gives an immediate notification of any payments made.
The only downside, already mentioned, is the self serve petrol stations. One station put a €120 authorisation charge on the card one day, which took 5 days to get refunded, which depleted the funds for a few days. Do this a few times, and you could run into issues.
I didn’t try withdrawing cash on it, but understand that there aren’t any charges, so for me the card is perfect, as I travel abroad regularly.