Excellent scientific article manager. Great features including bibliography creator. Tech support always quickly answered any question that I had.

A great science productivity app, getting better with each update. While the initial release of version 2.0 indeed let some features missing (while bringing great enhancements), the recent update to version 2.1 brought back many of these functions and also very much enhanced speed and stability. Personally, I use Papers almost every day and haven't experienced any stability issues. Then again, I am rarely using the manuscript function or the social media (Livfe) integration. In any case, Papers is 'back on track'...

When I first tried version 2 I was as frustrated as most reviewers here. Matching papers was and is a downgrade of sorts. There is no author merging, re-editing of an entry was almost impossible. On top of this, after firing P2 up for the 2nd time, the database had gotten corrupt. I remembered an option from P1 to fix this... but lo and behold, that had gone too!
I'm know giving P2 another try. There are still things missing, like merging of authors and searching could be better, especially for humanities. There are a lot of repositories or journals online (not just in JSTOR) but e.g. deGruyter, Menadoc etc. This is central. However, to be fair, Papers doesn't do worse than similar software, e.g. Mendeley. In fact, many things have improved. I can now edit and re-edit entries with ease. P2 runs stable for me and is now more responsive than P1. The ability to enter well-nigh every kind of written document is most welcome and overall quite well implemented. In addition to that, there is the "Manuscripts and Citations" function which is really nifty. Even if something similar has been available for ppl that use BookEnds the P2 implementation is really nifty. Yes, important things, like merging authors, extended duplicate managment (you do get a warning tho', when trying to import a paper already in your library) there's a whole range of really useful functions in P2, which add to P1. In terms of speed and stability, I found P2, as of now, to be on pair with P1 or better.
I think many of the low ratings here, albeit understandable for various reasons, also stem from the fact, that P1 is pretty good and that the standards and expectations were rather high. Make no mistake though, while Mendeley is fine, it lacks a good deal of what Papers has. Also, it forces you to sign up, which P2 doesn't. One reason I'm not going with Mendeley. While I was disillusioned when I first tried Papers 2, I now do see light at the end of the tunnel. Indeed, there is much light already. I do hope and think that the authors keep at their big task, to deliver the best Papers ever. I for one, am ready to buy Papers 2, trusting the good work to continue.

Much worst than the version 1.x Do not recommended. I made the upgrade as soon as the version 2.0 came out and I regret strongly. Many features lacking, software very unstable, consuming lots of CPU. And worst, the updates take forever, and when some new update comes out, there is nothing visibly better. Very, very disappointed. Totally not recommended, until the authors update to something at least the near what the version 1.x was.

I used Papers since version 1. It was my favorite bibliography search program and I experienced too a sort of "downgrade".
It is slower than 1, buggy, sometimes hanging and many things are difficult and no immediate (like matching as was in version 1).
As PDF reader I am still waiting for highlighting and underlining text functions.
I need this software for my research and I hope this will be ameliorated otherwise I would be forced to move in other directions.

Download works, but dmg fails to mount.