Honestly, I haven't come across any pdf software that can be so easy to use and yet be powerful in almost all aspects. Apart from OCR, commenting and the likes, the one biggest feature that has me wonderstruck is the editing capability. It's almost as if I were editing in a native word editor. Of course one cannot expect all the features of a word editor! But what I try to emphasize here is that you don't need a word editor to make corrections or change a few lines here and there. UPDF takes care of this really well. With many more features to arrive in the next couple of months, It could well replace some of the most popular PDF Apps out there. The UI and UX is crafted with only the user in mind...so needless to say...it's just wonderful.
I just hope that the UPDF Team takes good care of early adaptors like us and does not charge for new features down the road. This is well on it's way to become a Rockstar unless of course there are some really bad decisions taken by the management (which again looks improbable).
For fence sitters - Are you thinking twice? Seriously? At this one time price.....it's more than a steal. Just go for it.