Simply useful
Quick and easy to use.
I like the "push" history feature, and it would be even better if I had the option of tracing forward after moving backward (showing the forward word as a right arrow option along with the backward "pop" left arrow word). Left & right edge swipes to move forward & backward would be even more wonderful.
Auto completion would also be a nice enhancement, along with favorites & words to avoid customization.
Nevertheless, $.99 well spent!
not@work about
Writing Aid — Dictionary & Word of the Day widget