Wasnt bad, at first. But completely useless on iPad Mini Retina: Blue button icons are ILLEGIBLE (*if Display is set on BOLD, which works fine on all other apps), and yes - even on full size iPad, it is a hair-trigger mess to write with finger OR rubber-tip stylus pen. Ive been patiently waiting for a well-thought-through update for over a year, though it still needs a major overhaul to be worth purchasing. Even the free version of PDF Notes works better for same tasks.
Queeks about PDF Tools Professional - View, Read, Open, Edit, Export, Annotate, Sign and Fill Form Documents and Contracts