I have been playing over a year at Mason Slots Casino, and I think the rating from Casino Guru are a some conservative.
I think it is a great Casino, and they are absolutly fast to pay out withdrawal.
I have not had any problems, so I dont know about their support.
There could be more slots from more providers, and thats why I give them 4 and not 5, but they deserve regonition for their great site.

Something is wrong here.
They send commercial via sms, the call me but it is just a tape that’s telling me about offers. The problem is that I can not choose to avoid offers from my profile. Definitely against GDPR and I will report them if the don’t stop.
I have deposit 50€ many times running at 0.50-2.00€ but no win, not even bonus games. It feels like machines are slow like something is wrong. When I play well known games I have played for years, it just feels wrong here.
I definitely chose another site with better customer satisfaction and rating in the future.