I never withdrew anything from bustabit. Because, whenever I bet for a large amount, it'll bust at 0 or <1 
but still it's a good time killer game
but still it's a good time killer gameif i'm betting with a large amount i wait for many reds first, still risky but atleast i feel i have a chance with my large bet,
Still never experience to gamble my bitcoins in bustabits but i heard that they are not provably fair.. i just heard it to others .. Thats why i don't try my self to gamble in that site..
you can hear bad / good things from 2 different people, bad news from people who always lose and good news in people who always win
you wont be able to test the provably fair until you try to play it yourself and not just believing on the opinion of people who have the experience to play there.