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The Big Five normative test had been replaced by HEXACO or Big Six test.
Please read: The 8 tips to innovate in the Online Dating Industry!
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