Enjoyable Not Great (no spoilers)
Some interesting choices on this one from the director. The film was enjoyable and the acting was solid throughout by all involved...but two of the characters were written rather cartoonish (the younger couple) and the story just never gave us any reason to understand what Kath saw in her boyfriend. They had no chemistry to speak of and seemed more like siblings than a couple. Some heavy suspension of disbelief on the "science" towards the end, but by that point I think I was ready for the movie to be over any ways.
Again, it was enjoyable, I don't regret renting it. Some interesting twists, but the story could have been better fleshed out to really make this stellar.