Reloadable pre-paid credit card

Did any of you have one of those "Reloadable pre-paid credit card" ?
Some bank offer those card..
Can we use it on gamble sites?
If yes , tell us in which country you are and in which country the card work..
You can also tell us if the card had some fee...
Can we cash-out on this card?

It is not everyone who can have a credit-card.
For those who are tired to always get out to buy a gift credit-card when they need to deposit, "Reloadable pre-paid credit card" can be a solution...