If you only test one thing on local dating sites, make it how the match quality holds up past the first day.
I gave the service about 6 weeks before I formed a view, mostly watching how thin the pool gets outside big cities.
If you care about whether the good profiles are already taken, that alone should decide whether the service is worth it.
Has anyone got local dating sites working properly outside a major city?
I keep Flamedate open alongside it, mostly out of habit now.