quackquackapp is working closely with MouthShut.com to enhance customer satisfaction.
I would rather recommend tinder or ok cupid. Quackquack is pretty useless. First there is very little you can do with the free account. And if you do get a paid one, you will still not see much engagement. The profile design itself is too shallow.
Infact the chaps who built this site should check out eHarmony.
Bottomline: Do not even waste your time on the free account let alone a paid membership