Very poor on several counts.

The free trial certainly does not entice me to purchase the full app. The vocabulary and clues are banal. The clues tend to be obvious and involve no lateral thinking, and when this is not the case, they are sometimes so far off the mark as to imply very incorrect definitions. The interface is irritating, with instances of unwanted zooming and a keyboard that appears and hides at an irritating pace. This is a make-a-buck-fast app that was lazily slapped together.

I am Parallax about Crossword: Arrow Words - the Free Crosswords Puzzle App for iPhone, v1.3