Decent!
Not a bad app, not the best. The iPad screen is too good for some of these low resolution shots. Free, however, is free - and there are some good ones.
damionp about
Pro HD Wallpapers Free - HD Wallpaper for iPhone, iPod and iPad, customize and edit High Definition pictures and photos in iOS7 and iOS6, Lock and Home Screen Wallpapers optimized for Retina Display