What I like is that app is more than a simple viewer of the website content. The main benefit to me is the ability to save any FAQ or Guide to your phone so you can read it offline. Even though home consoles will generally be in good areas of Wi-fi, it's far faster to have the guides you consult already on your smartphone.
GameFAQS guides are generally formatted as 80 column wide plain text files, which are just about readable in portrait mode on a Windows Phone handset, but are easily read in portrait mode. Being plain text means they might not look brilliant, but they are clear and legible when you're in the middle of the firefight on Call of Duty, or balancing on the top of a platform in Super Mario Bros 27.
It's a free download via the AAWP App Directory. What are you waiting for?