I wrote a review and gave duckyluck 4 stars three months ago. I've been a member for almost 2 years and play on their site occasionally, but not regularly. This is mainly because they don't have the specific slots that I like to play.
As far as payouts go, I haven't had any problems. Recently, I had some good luck and my account balance reached $36,100. The maximum withdrawal for Bitcoin is $2500 per week.
I was able to request 5 Bitcoin withdrawals at once, each for $2500, and received a payment into my Bitcoin wallet every week without any issues. When the 4th week came around, I submitted another 5 bitcoin withdrawal request. I just wish the withdrawal limit was higher.