It works for me (iPhone 5, iOS 8.1). Just tested the potions hack. Unfortunately, if you have diamonds on your account, they still will be spend (7 gems per refill) as usual, though, you cant see when it happens due to the potion indicator always shows 255 potions left. Hoewever, it still works if you don't have any diamonds at all so it has its pros as well as its cons . I did lose well over 50 diamonds before I realized it so be sure to spend your diamonds right away as soon as you get them. Ideally on inventory space.