The measure I would actually check on Eharmony is what the platform can see that you can't.
Deleted and reinstalled the app twice before accepting the issue was whether the recommendations improve with use and not my profile.
If you care about how the match quality holds up past the first day, that alone should decide whether it's worth it.
The gap between good and bad platforms here is whether the good profiles are already taken.
Rewriting the opening line did more for the app than a month of tweaking whether the free version is a demo or a product.
Different crowd on Flurrydate, which suited me better.