eHarmony, is a 15+ years old obsolete site and a HOAX, based on a big scientific fraud, only sustained by big marketing budget.
The Big Five normative test had been proven/revealed as an incomplete and incorrect model to assess/measure personality of persons.
The Big Five normative test had been replaced by HEXACO or Big Six test.
article "Critics challenge the 'science’ behind online dating"
Proof of FRAUD from eHarmony
The 4 biggest eHarmony's copycats
I live in a South American country and I am really astonished to see how online daters in "1st World" countries are really victims of human experimentation. No actual online dating site is "scientifically proven" because no one can prove its matching algorithm can match prospective partners who will have more stable and satisfying relationships -and very low divorce rates- than couples matched by chance, astrological destiny, personal preferences, searching on one's own, or other technique as the control group in a peer reviewed Scientific Paper for the majority (over 90%) of its members.
The Online Dating Industry is performing like the Pharmaceutical and Cosmetic Industry before the USA Food and Drug Administration was created. There is no/weak Legislation, no ID verification, low reliable background checks, no Quality Norms.
No one compatibility matching method is Scientifically Proven.
The entire Online Dating Industry for serious daters in 1st World Countries is a HOAX, performing as a Big Online Casino, with a low effectiveness/efficiency level of their matching algorithms (less than 10%). In the same range as searching by your own.
The key to long-lasting romance is STRICT PERSONALITY SIMILARITY and not "meet other people with similar interests".
The Online Dating Industry needs a very powerful algorithm like the "Teller Ulam design". In this case 100 times more powerful than actual matching algorithms.
Not 100% better, 100 TIMES better