Just got back from Pirates of the Caribbean: On Stranger Tides. It was not un-satisfactory. But I’m not here to review it. 

 So, we all know mermaids are in the film. The effects are good and the fabled creatures have a good amount of screen time. What isn’t shown in the trailers is that the main mermaid, Syrena, at one point converts her tail to legs. She turns her legs back to tail later, but it is off screen.

So yeah, lots of sexy/deadly mermaids, good  effects/costumes, and even a bit of a transformation. Whatever your opinion of the film the mermaids are absolutely done well and worth seeing.