Agreed on the whole. How aggressively it pushes credits at you is the bit I would test first.
The measure I would actually check on that one is how anonymous you actually stay in practice.
Took me about 5 weeks on Facebook Dating to work out that the real question was how granular the visibility controls get.
Where that one works it works fast; where it doesn't, how granular the visibility controls get is usually the reason.
I had a better run on ezhookups.online, for whatever that is worth.