Honestly, most of the free apps have made the free version harder to use, which is worth knowing before you sign up. Despite the fact that people disagree here, the step that matters most is to test two platforms at once: the first week is never representative.
When your inbox is dead, most of the free apps tend to feel quite a lot worse than they are, though it settles down after a while. Over two or three attempts the older established sites have dropped the feature everyone used, which changes the whole experience.
Avoid opening with a compliment, because it costs nothing to try, and nobody warns you about it. The boost system and the photo review pull in opposite directions, so results vary more than you'd think.
On the same subject, Datelink works noticeably better for quieter weeknights, going by the last few threads.