Quickflirt is linked to other sites owned by the same company. They use your profile on other sites, send computer made messages to a wink you send -- often to women who do not exist, and they have employees who will send you messages to get you to pay for more services.
Cupid is a criminal operation. Most US banks will not let you use their credit cards to sign up for a reason -- Cupid will renew your paid membership even when you have an end date. They hide the place where you get to stop the subscription. Most people have to google to find the page. It is also filled with romance scammers -- and they are not removed even if you report them. I know, I've reported them and they were never removed. -- If you want waste money join. If you want to meet real people go somewhere else.