Everything will be fine if you play fair and you can contact their support for any help needed in bitcointalk forum or on website.
There is many competitions with free bets or you can test how website works with test mode.
On my part, I am not saying a specific casino is better than the other. Because as a gambler, we have our own preferences, maybe withdrawal fees, bonus, or deposit currencies, or the games itself. And sometimes, it changes according to our mood or depending on our funds for that day. So for me, you can always choose which one suits you best depending on the situation you are in. Just do your own homework regarding the reputation of the casino before sending any funds to them.