Where free dating apps stands or falls is whether the sorting can be trusted.
Gave free dating apps a fair run over 6 weeks and kept coming back to how quickly it starts asking for money.
Where the service works it works fast; where it does not, how much control you get over who sees you is usually the reason.
After a few weeks on that one the only question left was whether the search actually respects what you set.
Someone in another thread pointed me at what Flamedate does with filters and it was a fair shout.