After the Sunset is supposed to be a fun romantic comedy, but it mostly falls flat as result of a medicore plot and limited character development. So, in my view, it is worth a rental not a purchase.
The only thing that saves it from not even being worth renting is the beautiful cinimatography. Also, a pretty good performance by Harrelson (even if he somewhat mis-cast as an incompetent FBI agent, and he appears to be having a good time in spite of the audience) and the presence of Hayek help make it passable. Brosnan feels like he phoned in this performance, likely sensing (correctly) that it was a "throw-away" movie.