Duglas T.Stewart from BMX Bandits about Goodnight Monsters: "Goodnight Monsters music makes me feel 20 years younger, it makes me feel like the sun is in the sky and everything
in the world is good. Even when these things aren't really true when I close my eyes and listen to them it feels that way. Perfect pop.".
Tim Sendra at Allmusic: "Goodnight Monsters second album Summer Challenge is just as sticky sweet and crème-filled as their first, The Brain That Wouldn't Die. The main difference is that they now sound less like a bedroom pop project and more like a real live band. The guitars are richly layered and chiming, the drums louder (and mostly provided by humans rather than machines), and the vocals are more confident and up-front. The sound has jumped from a tinker toy Modern Lovers to a West Coast pre-Teenage Fanclub. (...) Many of them are mixtape winners and in "First One on the Beach" they have a knockout summer jam pitched somewhere between JAN&DEAN and NRBQ. (...) Summer Challenge is one of the most pleasant and enjoyable hidden gems of the summer of 2008."