Good film, entertaining, easily digestible, does a fine job building up the tension although you know everything went well (resorting to the cliched 'the car won't start!' device was lame, but thankfully brief). Agreed with Markku there's not a lot to "hang on" to, but it's fun while it lasts.
Acting-wise I thought Scoot McNairy was by far the stand-out, too bad he won't get any attention. Clea DuVall was very good too.