I am making a personal observation about the sound I hear while playing the games. As far as my statement of reading 3 operator controlled payout levels, that came from another forum. I'll be happy to link it or name it if you would like me to.
It's not like there are many choices since I am in the USA. I have won some and lost some playing RTG casinos. There are only 3 groups that I will play now because I have successfully made withdrawals from each.