So contrary to the other reviews, this one paid out after 3 months.
I found the actual site to be a bit odd - most of the other sites let you use your bonus up then you start on actual cash. Kitty Bingo are the opposite way round. You use up your cash before bonus. If you win some cash you then have to use that before you can go back to your bonus.
Most of the bingo games seemed to be very low wins in relation to bets, sometimes barely winning back more than the bet itself. I suspect this is because there were not very many people on.