If you are betting a bigger amount of money, I think it is just right to look for an old gambling sites who are reputable, I am sure primedice is a good site if you are gambling for a dice games, but if you want to try with the site you mention, you can always gamble with a little amount of money so you can prove it yourself.
i think the same because if we play on the reputable and recommended gambling site, we can play gambling without any worried to get scam by that site. and if we want to make bigger amount to bet, its should be fine to do and we can continue to play the games.