I had used Papers for a couple years off and on. I really thought it was worth the money, but after I discovered Mendeley, I found it more useful. The built i

I had used Papers for a couple years off and on. I really thought it was worth the money, but after I discovered Mendeley, I found it more useful. The built in synchronization of Mendeley works better than using Papers + Dropbox (which didn't work well). Importing papers seemed easier with Mendeley and a browser. Also, I have a couple of personal Macs and an Ubuntu box at work and it's nice to be able to run Mendeley on both. I might not be up to date on all the features of Papers but I am pretty sure they never added a better way to sync between computers.