Their cards are very appealing and do have perks. However they have limitations that no other cards on planet earth do. Talking major limitations like not being able to pay on certain well known and respectable websites... or not sending a replacement card if stolen/lost abroad. Contacting customer support in these cases is useless, you will receive just friendly "nothing we can do" replies. Sad not being able to use it as main cards, especially since investing/staking big money to get the card!