It seems to me as if this app is still in development, and it has come some way in the past few months. It still has to mature quite a bit to get to the point of competing with PDF Expert. The use of the Apple pen to get clean crisp lines at various thicknesses needs a lot of work if this is to appeal to the professional (the drawing and signing is clumsy at best, and messy at worst), and its means of annotations with a wide variety of fonts needs a lot of upgrading. The general drawing tools also needs to improve in terms of variations available. It would also be useful to have the ability to apply a comment to a highlight or shape. The signature is not secure to use at all; I would not recommend this app for anyone needing to sign documents. PDF Expert is still way ahead in this department. Even on a flattened export the signature is available to copy and paste into document editors such as MS Word. This is not the case with PDF Expert.